Dynamax Dynaquest XL Super C diesel motorhomes for sale at Motor Home Specialist, the #1 Volume Selling Motor Home Dealer in the World, and a full-line Dynamax RV Dealer. The Dynamax® Dynaquest® XL is a Super C diesel motorhome built on the commercial-grade Freightliner® M2 112 PLUS chassis, paired with the Cummins® L9 turbo diesel engine and Class A diesel pusher-level amenities. Browse the largest selection of new and used Dynaquest XL inventory at MHSRV, all backed by industry-leading discount pricing.

The Dynaquest XL is built for a specific buyer: someone who wants the chassis credentials, powertrain, and luxury appointments of a flagship Class A diesel pusher in a Super C-style footprint with a more familiar truck-cab driving experience. Many Dynaquest XL owners are downsizing from a 40-foot Class A diesel pusher because they want easier maneuverability, better service-network access, and a smaller turning radius — without giving up the Cummins L9 powertrain, the Aqua-Hot hydronic system, or the residential-quality interior they're accustomed to.

Every Dynaquest XL pairs the Cummins L9 turbo diesel (450HP / 1,250 lb-ft of torque) with the Allison® 3200 TRV six-speed automatic transmission, sitting on the Freightliner M2 112 PLUS chassis (33,000-pound GVWR, 54,000-pound GCWR). It's the same L9 engine used in flagship Class A diesel pushers like the Tiffin Phaeton and Allegro Bus, delivering commercial-grade diesel performance rather than the lighter-duty powertrains found in conventional Class C and most Class B+ products. The Airliner 21,000-pound rear air suspension, full air brakes with 4-wheel ABS, C-Brake by Jacobs engine brake, and 275-amp alternator round out a commercial-tier chassis package.

Towing capacity is the practical headline: a 20,000-pound trailer hitch with 2,000-pound tongue weight rating, well-suited for pulling a fully-loaded enclosed car hauler, a tandem-axle equipment trailer, a large boat, or a multi-vehicle setup. The 100-gallon twin aluminum fuel tank setup (with the Equiflo inboard fuel system) and 54,000-pound GCWR provide the operational headroom to actually use that capacity.

Standard ADAS includes Active Brake Assist, Front Collision Warning, Lane Departure Warning, and a Quad-View camera system (right side, left side, hitch, and rear horizon). The Sony 10.1-inch HD touchscreen infotainment system supports wired and wireless Apple CarPlay and Android Auto, paired with the JBL premium cab sound system tuned specifically for the Freightliner M2 cab. Driver and passenger seating is leatherette air-ride with air lumbar controls.

Inside, every Dynaquest XL features hardwood raised-panel cabinetry with five-piece drawer fronts and dovetail joints, luxury vinyl tile throughout, a soft-touch padded vinyl ceiling, dimmable LED recessed lighting, the Bose sound system, magnetic thermal reflective front privacy shades, and USB/USB-C charging throughout. The kitchen pairs residential-grade appliances — a 24-cubic-foot residential refrigerator with ice maker (16-cubic-foot with a side pantry on the 3200KD), an induction range, a convection microwave with air fryer functionality, and solid surface countertops with LED edge lighting. The master bedroom features a King-size bed with a gel-infused memory foam mattress, a deluxe padded headboard, a cedar-lined wardrobe with digital safe, and a Bose sound bar on every floor plan except the 3200KD.

The Dynaquest XL is offered in five floor plans, each with a different character. The 3200KD (34'4") is the most compact, with theater seats standard and a single roof-mounted awning. The 3400KD (37'2") steps up to dual awnings and the larger residential refrigerator. The 3700BD (39'8") is the bunk-equipped family-flagship floor plan — twin bunk mattresses, privacy partition, and dual bunk CD/DVD players, a configuration that's genuinely rare in the Super C segment. The 3700RB (41'3") is the rear-bath flagship with dual under-mount sinks in the full rear bath. The 3801TS (39'8") swaps the standard living-area TV for a pop-up 50-inch LED Smart TV and electric fireplace entertainment center combination.

For electrical and climate, the Dynaquest XL ships with an 8kW Onan diesel generator (pulling from the main 100-gallon fuel supply), a 3,000-watt hybrid pure sine wave inverter/charger, the Aqua-Hot 450D diesel hydronic heating system with engine pre-heat, dual ducted 15,000-BTU low-profile air conditioners with heat pumps, and Firefly multiplex wiring with touchscreen command center and Bluetooth smartphone app control. Standard solar is a 200W glass panel with 30-amp controller paired with dual Group 8D AGM batteries (490aH total). The optional Xplorer Package upgrades to a 1,000-watt solar package with lithium house batteries, an insulated cab curtain, and an insulated utility bay for serious shoulder-season and boondocking capability.

Construction throughout uses 2-inch aluminum-framed laminated sidewalls with high-density block foam insulation, composite exterior fiberglass with no exterior wood, aluminum-framed floor and roof trusses, a crowned one-piece fiberglass roof, dual-pane dark-tinted frameless square windows with built-in night shades and screens (standard, unlike many Class C and Super C competitors), and automatic four-point hydraulic leveling jacks. Custom full-body paint with scheme-matching cab door jambs is standard, with the optional Black Out Package available for buyers who want a blacked-out exterior aesthetic in place of the standard chrome and stainless accents.

MSRP on the 2026 Dynamax Dynaquest XL starts at $450,584 for the 3200KD and ranges up to $492,760 for the 3700RB, exclusive of tax, license, registration, freight, additional options, and dealer prep and fees. Motor Home Specialist offers industry-leading discount pricing on every new Dynaquest XL for sale, well below MSRP.

Cross-shopping the Dynaquest XL? Within Dynamax's lineup at MHSRV, also consider the Dynamax Isata 6, Isata 4, and Isata 3. Buyers cross-shopping the broader Super C diesel segment typically also evaluate the Thor Magnitude Grand, Thor Inception, Newmar Super Star, Renegade Verona, and Tiffin Allegro Bay, all available at Motor Home Specialist alongside the Dynamax lineup.

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.