2025 Grand Design Solitude 310GK vs 2025 Grand Design Solitude 390RK

Detailed Comparison

Comparing the 2025 Grand Design Solitude 310GK to the 2025 Grand Design Solitude 390RK reveals some interesting trade-offs that could influence your buying decision.

In terms of footprint, the Grand Design Solitude 310GK stretches 30.5 ft while the Grand Design Solitude 390RK spans 30.5 ft. Weight-wise, the Grand Design Solitude 310GK is the lighter rig at 12,500 lbs versus 15,400 lbs.

Capacity-wise, expect to sleep 6 in the Grand Design Solitude 310GK versus 10 in the Grand Design Solitude 390RK. With 5 and 4 slide-outs respectively, the parked floor plans differ significantly.

Tank capacities are a key off-grid consideration. The Grand Design Solitude 310GK carries 64 gal of fresh water, 59 gal gray, and 48 gal black. The Grand Design Solitude 390RK offers 70 gal fresh, 68 gal gray, and 41 gal black. The Grand Design Solitude 390RK has the edge for extended dry camping.

Budget-wise, the Grand Design Solitude 390RK is listed at $62,000 compared to $80,000 for the Grand Design Solitude 310GK.

For family camping trips, the larger floor plan and additional berths make a real difference. For boondocking, the model with superior solar and battery setup will keep you comfortable off the grid longer. If you're going full-time, the larger tanks and more robust build quality matter enormously.

Both options have earned their place in the market. Your trip style and budget should be the final tiebreakers.