2025 Grand Design Solitude 280RK vs 2025 Heartland Milestone 370FLMB

Detailed Comparison

When it comes to the 2025 Grand Design Solitude 280RK versus the 2025 Heartland Milestone 370FLMB, the right choice depends on your travel style and priorities.

In terms of footprint, the Grand Design Solitude 280RK stretches 34.5 ft while the Heartland Milestone 370FLMB spans 38.0 ft. Weight-wise, the Grand Design Solitude 280RK is the lighter rig at 8,300 lbs versus 10,700 lbs.

For sleeping arrangements, the Grand Design Solitude 280RK offers room for 6 and the Heartland Milestone 370FLMB can handle 6. The Grand Design Solitude 280RK benefits from 4 slide-out(s), expanding the interior when parked.

Looking at self-sufficiency, the Grand Design Solitude 280RK packs 57 gal of fresh water and 550W of solar. The Heartland Milestone 370FLMB counters with 74 gal fresh water and 250W solar.

Price is often the deciding factor. The Grand Design Solitude 280RK starts at $171,000 MSRP, while the Heartland Milestone 370FLMB commands $173,000 — a $2,000 gap.

Families with kids will appreciate the extra sleeping capacity and living space. Off-grid campers should pay close attention to solar wattage, battery capacity, and tank sizes. Full-timers should prioritize tank capacity, storage, and overall living comfort.

At the end of the day, the best RV is the one that fits your travel dreams and budget. Either of these is a worthy choice.