2025 Grand Design Solitude 390RK vs 2025 Forest River Riverstone 39RKFB

Detailed Comparison

The 2025 Grand Design Solitude 390RK goes up against the 2025 Forest River Riverstone 39RKFB in this detailed comparison. Each has distinct advantages worth considering.

Dimensionally, you're looking at 30.5 ft for the Grand Design Solitude 390RK and 28.0 ft for the Forest River Riverstone 39RKFB. The Grand Design Solitude 390RK carries an extra 3,800 lbs, which affects tow vehicle requirements and fuel economy.

The Grand Design Solitude 390RK sleeps 10 while the Forest River Riverstone 39RKFB accommodates 5. Slide-outs play a role in livability: the Grand Design Solitude 390RK has 4 and the Forest River Riverstone 39RKFB has 1.

For boondocking enthusiasts, tank sizes matter. Fresh water capacity goes to the Forest River Riverstone 39RKFB at 87 gallons versus 70 gallons. Solar-wise, you get 400W on the Grand Design Solitude 390RK and 100W on the Forest River Riverstone 39RKFB. Battery banks are 300 Ah and 250 Ah.

At $62,000 MSRP for the Grand Design Solitude 390RK and $62,000 for the Forest River Riverstone 39RKFB, the Forest River Riverstone 39RKFB saves you $0. With only a 0% price difference, the choice comes down to features rather than cost.

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.

Whichever you choose, you'll be getting a capable rig. Just make sure to inspect one in person before signing.