Grand Design Solitude 380FL vs Grand Design Solitude 310GK
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Quick take: The Grand Design Solitude 310GK costs $7,000 less; the Grand Design Solitude 310GK is 8 ft shorter and easier to maneuver.
| Spec | Grand Design Solitude 380FL | Grand Design Solitude 310GK |
|---|---|---|
| Price | $105,000 | $98,000 |
| Rating | 4.7★ (3,800) | 4.7★ (3,100) |
| Type | Fifth Wheel | Fifth Wheel |
| Year | 2025 | 2026 |
| Length | 42 ft | 34 ft |
| Weight | 15,200 lbs | 12,100 lbs |
| Sleeps | 4 | 4 |
| Fresh water | 72 gal | 81 gal |
| Slide-outs | 4 | 3 |
| Solar | 200W | 200W |
| Four-season | Yes | Yes |
| Pet friendly | Yes | Yes |
| Towable | Yes | Yes |
| Chassis | — | — |
Why owners pick each
Grand Design Solitude 380FL
- ✓Front living room layout maximizes entertaining and relaxation space
- ✓Grand Design's warranty and customer service are best in the industry
- ✓Built specifically for full-time living with residential fixtures
Grand Design Solitude 310GK
- ✓106 gallons of gray capacity plus 81 fresh makes long off-hookup stays realistic
- ✓35K BTU furnace and enclosed, heated utility center handle genuinely cold weather
- ✓Rear-living triple-slide layout lives like a residential condo at 34 feet
What owners report
Grand Design Solitude 380FL
- ✓The front-living floorplan is the whole point — a huge, bright great room up front with theater seating and big windows that feels like an apartment, not a trailer
- ✓Built as Grand Design's full-profile luxury line: drop frame for massive basement storage, hydraulic six-point auto-leveling, and thicker sidewalls than the Reflection
- ✓Two full bathrooms and a residential refrigerator make it a legitimate full-time and large-family rig
- ✓Owners praise the 14-inch master mattress and the genuinely comfortable residential-grade furniture
- ✓On-demand tankless water heater means you're not racing a 6-gallon tank for showers
- ✓Grand Design's owner community (mygrandrv.com) is huge and helpful — almost any question has been answered already
- ✓Even with post-2020 quality grumbling, the Solitude is still regarded as one of the better-built fifth wheels you can buy without going full luxury
- ✗Front-living layouts split the living space from the kitchen/bedroom, and the front cap's tall windows make front-cap leaks and seal maintenance a watch item
- ✗Warranty support and Grand Design customer service have drawn real criticism, with owners reporting slow responses and long reimbursement waits
- ✗Reported defects include slide-seal failures, auto-leveling glitches, punctured water lines, and screws backing out through the floor
- ✗At roughly $105K it's a serious financial commitment, and depreciation on a six-figure fifth wheel is real
- ✗The sheer length and height limit which campgrounds and sites you can fit into, especially older state parks