2021 Rossmonster Custom
2021 Rossmonster Custom 144 MB 4x4 19' 6" Class B Motorhome. Mercedes Benz 3.0L V6 Turbo Diesel Engine. Sleeps 2, A/C Unit. Transmission: 9G-TRONIC automatic. Hit the road today!
We are the second owners of this van, purchased directly from Rossmonster (Longmont, CO) in December 2024. It‘s a high-quality custom adventure van, ideal for two people plus bikes/gear.
Chassis (2021 Mercedes-Benz Sprinter 144, 2500, 4x4):
Powered by a 3.0L V6 turbodiesel (188 hp / 325 lb-ft) with 9G-TRONIC automatic transmission. Features include heated and power swivel front seats, 7” MBUX touchscreen with Apple CarPlay/Android Auto (wireless adapter included), USB-C ports, and driver assists (Active Brake, Lane Keeping, Attention, Blind Spot). Power sliding door with step, 2” hitch receiver, and extended Mercedes-Benz warranty through Sept 13, 2026. Regular oil changes, fuel filter replaced July 2025, and annual dealer inspections. Note: original power step was painted grey by prior owner and shows some wear.
Rossmonster Conversion Highlights:
Wool insulation, Duramax fabric walls/ceiling, custom walnut cabinetry with butcher block, and crimson dinette cushions (convert to single bed with seatbelts). L-track throughout, dimmable LED lighting, and large under-bed slide-out for bikes/gear.
Electrical & Power:
Victron system with 800Ah lithium batteries (heated), 3000W inverter, shore power, 4 AC outlets w/ USB, 200W solar, and dedicated under-hood auxiliary alternator for fast charging.
Interior & Amenities:
40-gallon fresh water tank, 7-gallon grey tank, stainless sink with sprayer, 2-burner induction cooktop, 4.6 cu ft Isotherm DC fridge (drawer style), Rixen diesel heat + hot water, Dometic A/C, MaxxAir fan, soft cab partition, window coverings, and magnetic bug screens. Optional Porta Potti included (no black tank).
Exterior & Upgrades:
Method wheels, Falken Wildpeak AT3W tires, Agile Offroad RIP suspension, Owl storage box, 1Up 2-bike rack, CR Laurence T-Vent window, Fiamma manual awning, and outdoor hot shower.
Also includes Inhabit Design Works cab mats.
This van has been well cared for and built for comfort, off-grid capability, and adventure. We‘re selling due to early retirement and downsizing.
Youtube video link - short - 7 minute walkthrough by Rossmonster before it went to it‘s first owner - https://youtu.be/nL3PyQlkuHA
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