Dynamax Grand Sport
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Dynamax Grand Sport Super C Diesel Motorhomes For Sale
Dynamax Grand Sport Super C diesel motorhomes for sale at Motor Home Specialist, the #1 Volume Selling Motor Home Dealer in the World and the #1 Dynamax RV dealer in the country. The Dynamax Grand Sport is the top of the Dynamax Super C lineup, built on the Freightliner Cascadia 126 tandem twin-screw chassis with the Detroit DD16 15.6L diesel at 600 horsepower. Shopping for a new Grand Sport or a used Grand Sport? MHSRV stocks new and used Dynamax Grand Sport Super C motorhomes backed by industry-leading discount pricing.
Who the Grand Sport Is Built For
The Grand Sport is the most powerful motorhome in the Dynamax Super C family and sits above the DX3 and Dynaquest XL in chassis rating, engine output, and towing capacity. It's built for buyers at the very top of the Super C category: stacker trailer haulers, race team owners, full-time RVers with multiple tow vehicles, and shoppers cross-shopping the Grand Sport against luxury Class A diesel pushers and other heavy-duty Super C motorcoaches. The 80,000-pound GCWR, the 40,000-pound pintle-hitch capability, air brakes, three rooftop A/Cs, three lithium house batteries with 800 watts of solar, and the Oasis hydronic heating system put the Grand Sport in a different weight class than standard Super C platforms.
Chassis and Powertrain
The Grand Sport is built on the Freightliner Cascadia 126 chassis with a tandem twin-screw rear axle configuration, a 58,000-pound GVWR, and an 80,000-pound GCWR. Power comes from the Detroit DD16 15.6L diesel at 600 horsepower and 1,850 lb-ft of torque, paired with the DT-12 Efficient 12-speed automatic transmission, a 3.08 rear axle ratio, the C-Brake by Jacobs (high/low settings), a 300-amp brushless alternator, and a 120-gallon fuel tank. The rear axle includes a locking differential. Ride comes from 40,000-pound rear air suspension with automatic deflation.
Air Brakes and Towing
The Grand Sport uses full commercial-grade air brakes with 4-wheel ABS, automatic slack adjusters, and a brake line air dryer with heater. That's significant: it's the same brake system used on Class 8 tractor trailers. The hitch package includes a 32,000-pound ball rating or a 40,000-pound pintle rating with a 6,000-pound tongue rating, positioned for buyers who tow stacker trailers, race trailers, or other very heavy tow loads. Glad Hands air brake connection and controller adds tow vehicle air brake compatibility for compatible trailers.
Driver-Assist and Cockpit
Driver-assist runs the Detroit Safety Assurance Package: Active Brake Assist, adaptive cruise control, lane departure warning, and the Detroit Connect Safety Event Viewer. A Bird's Eye View 360-degree camera system, the Bendix SmarTire banded tire pressure monitoring system, and a 10-inch touchscreen dash infotainment with wired and wireless Apple CarPlay and Android Auto round out the tech. Cockpit standards include leatherette air-ride driver and passenger seats with swivel bases, a leather-wrapped Smart Steering Wheel, an adjustable steering column, dual bright remote heated mirrors, an air horn, and 3-point seatbelts.
Body and Exterior
The body runs 2-inch aluminum-framed laminated sidewalls with high-density block foam insulation, Azdel composite exterior fiberglass (no exterior wood), a steel basement structure, vacuum-bonded aluminum roof trusses with high-density block foam insulation, and a one-piece molded fiberglass roof cap. Exterior standards include custom full-body paint with scheme-matching cab door jambs and slideout sides, a premium cut-and-buffed finish, front-end Diamond Shield paint protection, dual roof-mounted integrated armless patio awnings with LED lighting and wind sensors, aluminum-wrapped slideout toppers, an LED patio light, a 30-inch entry door with rotary latch and dark-tinted frameless window, a keyless entry touch pad, the One Key locking system for exterior storage doors and entry door, remote-locking exterior storage doors, a lighted acrylic entry grab handle, power entry steps, front and rear LED clearance and marker lighting, side docking lights, and the rear DYNAMAX rock guard. The exterior wall-mounted entertainment center pairs a 40-inch LED Smart TV with an integrated JBL soundbar on a swivel mount. Dual-pane dark-tinted frameless square windows include built-in night shades and screens, with a bonded front cap window and power shade. Steel storage compartments include LED lighting and side-hinged locking aluminum doors with chrome handles. Automatic 4-point hydraulic leveling jacks come standard.
Climate, Power, and Off-Grid
Climate control uses three ducted low-profile 15,000 BTU rooftop air conditioners with heat pumps, the Oasis hydronic diesel heat system with continuous hot water, and Oasis-heated holding tanks and utility compartment. Power management runs a 10-kilowatt Onan diesel generator with auto transfer switch (mounted on isolator pads), automatic generator start, three low-temp lithium house batteries (486 Ah total), four 200-watt glass solar panels (800 watts total) with MPPT controllers, a 2,800-watt hybrid pure sine wave inverter/charger, 50-amp service with a 34-foot power cord reel, and an Energy Management System. Coach systems route through the PrecisionPlex Multiplex control platform with touchscreen and Bluetooth mobile app. Waste and water gear includes a Thetford Sani-Con Turbo macerator system, a 4-way water management valve in the sewer bay, a black tank flush, the Pressure Sense tank monitoring system, an upgraded 12V on-demand water pump at 4 gallons per minute, a power water hose reel in the service bay, an exterior shower, a central vacuum system, and a water filtration system. Starlink satellite internet is standard.
Interior
The interior runs heated porcelain tile flooring throughout, deluxe vinyl with pad in select living-area slide rooms, a soft-touch padded vinyl ceiling, a powered flush-floor stepwell cover, a lighted porcelain tile entry surround with fitted carpet mats, dimmable LED recessed ceiling lights, soft-touch sprung residential-style dinette seats with lift-up storage, a home theater lounge with USB ports, a love seat, hardwood Shaker-style cabinetry and passage doors, full-extension soft-closing drawer guides with dovetail joints, hidden hinges, a 50-inch LED Smart TV in the living area, and a Sonos Ultra Arc soundbar with subwoofer.
Galley
The galley pairs solid-surface countertops with accent lighting and a tile backsplash, a stainless steel sink with solid-surface covers (dedicated storage compartment for the covers), a residential faucet with pull-out sprayer, a power kitchen countertop extension, a pantry, overhead cabinet accent lighting, under-cabinet lighting, and a MaxxAir power vent with built-in rain cover. Cooking runs an induction range, a convection microwave with air fryer functionality, and a dishwasher. Refrigeration handles a 22-cubic-foot residential refrigerator with ice maker.
Master Bedroom and Cab-Over Bunk
The master bedroom runs a 70-by-80-inch king bed with a deluxe padded headboard, a designer bedding package, a 43-inch LED Smart TV, a fireplace, nightstands with solid-surface countertops, a digital safe in the wardrobe, LED reading lights, and USB charging ports. Every Grand Sport also includes an adult-sized cab-over bunk over the cockpit, with a 51-inch-wide mattress that tapers from 80 inches at the rear to 66 inches at the front, plus a privacy partition.
Dual Baths
The 45CB is a dual-bath layout with a mid bath and a rear bath, both with a porcelain electronic-flush macerator toilet. Bath amenities include a 38-by-40-inch solid-surface shower with a teak fold-down seat, glass door, shower skylight, deluxe multi-shower head system, the Aqua View SHOWERMISER water-saving valve, solid-surface countertops with tile backsplashes, under-mount sinks with residential faucets, back-lit vanity mirrors, and a MaxxAir power vent with built-in rain cover.
The 45CB Floor Plan
MHSRV offers the Grand Sport in one floor plan: the 45CB. It's the dual-bath layout (mid and rear) with the heated porcelain tile flooring, the home theater lounge, the love seat, the dishwasher-equipped galley, and the bedroom fireplace. Optional equipment is a stackable washer/dryer.
Shopping the Grand Sport against Dynamax's other Super C options? Compare it to the DX3 (Freightliner M2 106 Plus, Cummins L9 360HP, five floor plans) or the Dynaquest XL (Freightliner M2 chassis, Cummins L9 450HP, five floor plans). Or browse the full Dynamax RV lineup at MHSRV.
Dynamax Grand Sport FAQs
What is the Dynamax Grand Sport?
The Dynamax Grand Sport is the top-tier Super C diesel motorhome in the Dynamax lineup, built on the Freightliner Cascadia 126 tandem twin-screw chassis with the Detroit DD16 600-horsepower diesel. It carries an 80,000-pound GCWR, air brakes, three rooftop A/Cs, three lithium house batteries with 800 watts of solar, standard Starlink, and an Oasis hydronic heat system, all in a single 45CB dual-bath floor plan.
What chassis is the Grand Sport built on?
The Freightliner Cascadia 126 tandem twin-screw chassis. That's the same chassis family used under Class 8 tractor trailers, sized here for a motorhome application. The Cascadia carries a 58,000-pound GVWR, an 80,000-pound GCWR, and 40,000-pound rear air suspension with automatic deflation. Powertrain is the Detroit DD16 15.6L diesel (600 HP, 1,850 lb-ft) paired with the DT-12 Efficient 12-speed automatic transmission.
Is the Grand Sport a Super C?
Yes. The Grand Sport is a Super C diesel motorhome. It uses a heavy-duty Freightliner Cascadia 126 truck chassis with the Detroit DD16 diesel and includes a cab-over bunk, which puts it in the Super C category rather than a Class A diesel pusher. The Cascadia 126 with tandem twin-screw rear axles puts the Grand Sport above standard Super C platforms in chassis weight rating, air brakes, and towing capacity.
How much can the Grand Sport tow?
The Grand Sport carries a 32,000-pound ball hitch rating or a 40,000-pound pintle rating with a 6,000-pound tongue rating. That's real stacker-trailer and heavy-equipment-hauling territory. Glad Hands air brake connections and controller add tow vehicle air brake compatibility for compatible heavy trailers. Verify trailer and tow vehicle weights against the coach's actual GCWR before hooking up.
Does the Grand Sport have air brakes?
Yes. The Grand Sport uses full commercial-grade air brakes with 4-wheel ABS, automatic slack adjusters, and a brake line air dryer with heater. That's the same brake system used on Class 8 tractor trailers, sized for a motorhome application. Air brakes are one of the reasons the Grand Sport can safely handle the 40,000-pound pintle tow rating on heavy trailers.
What floor plans does the Grand Sport come in?
Motor Home Specialist offers the Grand Sport in a single floor plan: the 45CB. It's the dual-bath layout (mid bath plus rear bath) with a king bed, bedroom fireplace, home theater lounge, love seat, dishwasher-equipped induction galley, 22-cubic-foot residential refrigerator, adult-sized cab-over bunk, and heated porcelain tile flooring throughout.
What is the difference between the Grand Sport and the DX3?
Both are Dynamax Super C diesels, but they sit in different weight classes. The DX3 uses the Freightliner M2 106 Plus chassis with the Cummins L9 360-horsepower diesel, a 54,000-pound GCWR, a 20,000-pound hitch, the Allison 3200 TRV transmission, hydraulic brakes, and is offered in five floor plans (32KD through 37TS). The Grand Sport uses the larger Freightliner Cascadia 126 tandem twin-screw chassis with the Detroit DD16 600-horsepower diesel, an 80,000-pound GCWR, a 32,000-pound ball or 40,000-pound pintle hitch, the DT-12 12-speed automatic, full commercial air brakes, three rooftop A/Cs (versus two on the DX3), and a single 45CB dual-bath floor plan. Pick the DX3 for the more accessible Super C entry point and the wider floor plan choice. Pick the Grand Sport when you need serious heavy-duty towing, air brakes, and the DD16 engine.
What is the difference between the Grand Sport and the Dynaquest XL?
Both are Dynamax Super C diesels, but they target different buyers. The Dynaquest XL is a luxury-focused Super C on the Freightliner M2 chassis with the Cummins L9 450-horsepower diesel, offered in five floor plans and priced below the Grand Sport. The Grand Sport is the heavy-duty top-of-lineup build with the Cascadia 126 chassis, the DD16 600-horsepower diesel, air brakes, and the 40,000-pound pintle-hitch capability. Pick the Dynaquest XL for luxury Super C camping and a lower entry price. Pick the Grand Sport when you're towing stacker trailers, race trailers, or other very heavy loads.
Does the Grand Sport come in a bunk model floor plan?
Every Grand Sport includes an adult-sized cab-over bunk over the cockpit. The mattress is 51 inches wide and tapers from 80 inches long at the rear to 66 inches at the front, with a privacy partition. It's usable for a second adult rather than kid-only sleeping. The Grand Sport isn't offered in a dedicated interior-bunk floor plan configuration.
Does the Grand Sport have dual baths?
Yes. The 45CB is a dual-bath layout with a mid bath and a rear bath, both equipped with a porcelain electronic-flush macerator toilet. Bath amenities include a 38-by-40-inch solid-surface shower with a teak fold-down seat, glass door, shower skylight, and deluxe multi-shower head system. That's uncommon at any Super C length and one of the Grand Sport's defining features.
Does the Grand Sport come with solar?
Yes. Every Grand Sport comes standard with four 200-watt glass solar panels (800 watts total) with MPPT controllers, paired with three low-temp lithium house batteries (486 Ah total), a 2,800-watt hybrid pure sine wave inverter/charger, a 10-kilowatt Onan diesel generator with auto-gen start, and 50-amp service with a 34-foot power cord reel. Starlink satellite internet is also standard.
Does the Grand Sport come with Starlink?
Yes. Starlink satellite internet is included as standard equipment on every Grand Sport, which is uncommon in the Super C category (most manufacturers treat Starlink as an option or an aftermarket install). Combined with the 800-watt solar array and 486 Ah of lithium batteries, that gives owners genuinely off-grid-ready connectivity for extended stays without shore power or campground WiFi.
Do I need a CDL to drive the Grand Sport?
Federal law does not require a commercial driver's license (CDL) for a private, non-commercial motorhome, even when the vehicle exceeds 26,001 pounds GVWR. However, the Grand Sport's 58,000-pound GVWR, 80,000-pound GCWR, air brakes, and tandem twin-screw chassis push it into the weight range where several US states require a non-commercial Class A or Class B license endorsement (California, Wisconsin, Illinois, Hawaii, North Carolina, and a handful of others). Verify with your state DMV before purchase. Some buyers also choose to take a CDL air brake endorsement course for insurance and driving-confidence reasons, even where it isn't legally required.
How much does a Dynamax Grand Sport cost?
Pricing depends on selected options. The stackable washer/dryer is the primary factory option that moves the price. MHSRV discounts every new Grand Sport well below MSRP. Contact the sales team for a current out-the-door quote on any specific in-stock unit.
Where can I buy a Dynamax Grand Sport?
Motor Home Specialist in Alvarado, Texas is the #1 volume-selling Dynamax dealer in the country and stocks new and used Grand Sport Super C motorhomes at the main location. Buyers from all 50 states can arrange in-house financing, trade-in appraisals, and post-sale service coordination, whether picking up in person or coordinating remote handoff.
Manufacturer options, features, colors, etc. can all change without notice and MHSRV assumes no responsibility for the changes or possible errors in information provided by the manufacturer. All weights and measurements are approximate and not guaranteed to be 100% accurate. For the latest information be sure to check with your salesperson and/or the coach manufacturer and verify before purchase.
