2026 MODEL YEAR · CLASS B MOTORHOME
Interstate 24 24GTX
- adventure
- luxury
- off-grid
The Interstate 24GTX elevates the 24GT with bold exterior upgrades and adventure-ready capability, while preserving the same luxurious, spacious interior.
Specifications
- Length
- 24' 9"
- Height
- 9' 9"
- Base weight
- 9,423 lb
- GVWR
- 11,030 lb
- Net Carrying Capacity (NCC)
- 1,607 lb
- Tow capacity
- 5,000 lb
- Chassis
- Mercedes-Benz Sprinter 3500
- Engine
- Mercedes-Benz 2.0L Turbo Diesel I4
- Horsepower
- 208 hp
- Torque
- 332 lb-ft
- Drivetrain
- AWD
- Fuel type
- Diesel
- Transmission
- 9G-TRONIC Plus Automatic
- Sleeps
- 2
- Seats
- 7
- Fresh / gray / black
- 23 / 24 / 11
- Fuel tank
- 24.5 gal
- Solar
- 400 W
- Battery
- 10.3 kWh
- Inverter
- 3000 W
- Shore power
- 30 A
- Off-grid score
- 70 / 100
- MSRP
- $293,900
How long off-grid?
Boondocking endurance for this motorhome — modeled from its real 10.3 kWh battery, 400 W solar, and 23 gal fresh tank.
Fresh water fills first under these assumptions.
How this is calculated
Power: usable battery = nameplate kWh × 0.8 (blended depth-of-discharge). Daily load presets — light ≈ 1,500, moderate ≈ 2,800, heavy ≈ 5,000 Wh/day — from published boondocking power budgets, excluding air conditioning (no motorhome house battery runs rooftop AC for long). Solar harvest = panel watts × peak-sun-hours (summer 5.5, spring/fall 4.0, winter 2.5) × 0.7 system derate. Water: per-person daily use (light 3 / moderate 5 / heavy 8 gal fresh; gray ≈ 80% of fresh; black from toilet use) against the real tank sizes. Endurance is whichever runs out first. Estimates for planning — your real usage varies.
Strengths
- AWD for all-weather confidence
- Bold adventure-ready exterior
- 10.3 kWh lithium + 400W solar
Trade-offs
- Smaller waste tank (11 gal)
- Premium price for X upgrades
Gallery
