2025 Grand Design Solitude 280RK vs 2024 Grand Design Momentum G-Class 25G

Detailed Comparison

Two popular options on many shoppers' shortlists — the 2025 Grand Design Solitude 280RK and the 2024 Grand Design Momentum G-Class 25G. Let's see how they compare across the specs that matter most.

Starting with size, the Grand Design Solitude 280RK measures 34.5 ft long and tips the scales at 8,300 lbs dry weight. The Grand Design Momentum G-Class 25G comes in at 30.0 ft with a dry weight of 10,100 lbs. That gives the Grand Design Solitude 280RK roughly 4.5 extra feet of length.

The Grand Design Solitude 280RK sleeps 6 while the Grand Design Momentum G-Class 25G accommodates 6. Slide-outs play a role in livability: the Grand Design Solitude 280RK has 4 and the Grand Design Momentum G-Class 25G has 0.

For boondocking enthusiasts, tank sizes matter. Fresh water capacity goes to the Grand Design Momentum G-Class 25G at 95 gallons versus 57 gallons. Solar-wise, you get 550W on the Grand Design Solitude 280RK and 250W on the Grand Design Momentum G-Class 25G. Battery banks are 350 Ah and 100 Ah.

At $171,000 MSRP for the Grand Design Solitude 280RK and $41,000 for the Grand Design Momentum G-Class 25G, the Grand Design Momentum G-Class 25G saves you $130,000.

If you're traveling with a family, look for the model with more sleeping positions and better storage. Boondockers: look at the fresh water capacity and solar/battery systems — they determine how long you can stay out. For the full-time RV lifestyle, every gallon of tank capacity and every inch of counter space counts.

The numbers tell one story, but the feel of a floor plan is personal. Schedule a walkthrough before you decide.