2008 Dynamax Corp Grand Sport Ultra 450 UL LOCATED IN SAN DIEGO CA. 91942

2008 Dynamax Grand Sport Ultra 450UL — Pre-DEF Luxury Super C — Lithium-Ion Conversion

$179,900 OBO; reasonable offers considered.

62,203 miles | Freightliner Columbia chassis | 450-hp Mercedes-Benz diesel | 12-kW PowerTech generator

Built during Dynamax’s independent, pre-Forest River era, renowned for superior build quality and attention to detail, this 2008 Dynamax Grand Sport Ultra 450UL features full-body Ravenwood paint in black and gold. This premium Super C combines luxury residential living with commercial-grade towing and chassis capability – exceptional storage inside and out, luxury finishes, and documented 56,700-lb. GVWR and 80,000-lb. GCWR.

This pre-DEF coach rides on a heavy-duty Freightliner Columbia chassis, with air service lines at the rear hitch. Its Aqua-Hot hydronic heating system (including engine pre-heat) and heated floors in the living area and bathroom support comfortable travel across multiple seasons.

We are the third owners and lived in the coach full-time from August, 2021, through May, 2026. It has been meticulously maintained by Certified RV Inspectors and Certified RV Technicians. Currently stored indoors in San Diego, California, the motorhome is registered and licensed in Texas. Clean Texas title in hand; easy title transfer.

Mechanical / Exterior / Maintenance Highlights

• 450-hp Mercedes-Benz diesel engine (pre-DEF configuration)
• 140-gallon fuel capacity
• 6-speed Allison automatic transmission
• Engine oil and filter, engine coolant, transmission fluid and filter replaced/changed approximately 3,000 miles ago
• 12-kW PowerTech diesel generator with approximately 1,200 hours
• Generator oil and filter, generator coolant changed less than 50 hours ago
• Fluid analysis reports and service records available
• Aqua-Hot 600D heating and hot-water system
• Aqua-Hot burner rebuilt, circulation pumps replaced, system flushed in 2025
• Three 15,000-BTU ducted heat-pump air-conditioning units
• Commercial air brakes and air-ride suspension
• Automatic hydraulic leveling jacks with SnapPads
• Diamond Shield protection replaced in 2026
• Ten Michelin X-Line tires – 22,000 miles since installation in August 2021
• One-piece fiberglass roof
• New windshield glass and slideout toppers
• Backup camera operational; side cameras operate intermittently (requires troubleshooting/service)

  Upgrades

  • Four 172-Ah LiFePO4 coach batteries (12 V, 8.68 kWh total)
  • Dual Xantrex Freedom SW 3012 (3,000-watt) inverter/chargers
  • Upgraded LED lighting throughout, three Fantastic Fans with rain sensor, and window shades
  • Garmin GPS with dash camera
  • Water-resistant LVP in living area slideout and bedroom – no carpet
  • Sofa with double recliners
  • Flexible table and chair configuration for dining, games, crafts, work

  Luxury Interior

  The spacious 450UL floor plan features multiple slide-outs, an open-concept living area, high-quality cabinetry, and residential-style amenities.

  • 50 Amp all-electric coach
  • Heated travertine tile floors in living area and bathroom
  • Real wood cabinetry with upgraded hardware
  • Granite countertops
  • Electric fireplace
  • TVs in living area (2) and bedroom (1)
  • Bose sound system and DVD player
  • Residential 15-cu.-ft. refrigerator/freezer
  • Convection microwave and electric cooktop
  • One-piece fiberglass shower
  • Tecma macerator toilet
  • Splendide vented washer/dryer
  • King Comfortaire bed with dual controls
  • Extensive bedroom storage and cedar-lined wardrobes
  • Air-ride cockpit seating

  Extras with coach include Hughes Watchdog 50A Bluetooth EMS, 30A and 15A extension cords and dogbones, water filtration system, water hoses, sewer hoses, air compressor hoses, Trailer Valet XL Trailer Dolly, and 20’ telescoping flag pole with RV hitch flagpole holder.