2025 Grand Design Momentum 376THS vs 2024 Heartland Cyclone 4115

Detailed Comparison

Shopping for an RV and torn between the 2025 Grand Design Momentum 376THS and the 2024 Heartland Cyclone 4115? We've put together a detailed spec comparison to help you decide.

The Grand Design Momentum 376THS measures 28.5 ft in length at 10,700 lbs, compared to the Heartland Cyclone 4115's 42.5 ft and 9,700 lbs. GVWR ratings sit at 13,500 lbs and 12,400 lbs respectively.

Capacity-wise, expect to sleep 9 in the Grand Design Momentum 376THS versus 6 in the Heartland Cyclone 4115. With 0 and 3 slide-outs respectively, the parked floor plans differ significantly.

Tank capacities are a key off-grid consideration. The Grand Design Momentum 376THS carries 71 gal of fresh water, 65 gal gray, and 49 gal black. The Heartland Cyclone 4115 offers 65 gal fresh, 67 gal gray, and 43 gal black. The Grand Design Momentum 376THS has the edge for extended dry camping.

Budget-wise, the Grand Design Momentum 376THS is listed at $160,000 compared to $163,000 for the Heartland Cyclone 4115.

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.

Take these specs as a starting point, then go see them in person — there's no substitute for stepping inside.