2025 Heartland Milestone 370FLMB vs 2025 Forest River XLR Nitro 407

Detailed Comparison

Two popular options on many shoppers' shortlists — the 2025 Heartland Milestone 370FLMB and the 2025 Forest River XLR Nitro 407. Let's see how they compare across the specs that matter most.

Starting with size, the Heartland Milestone 370FLMB measures 38.0 ft long and tips the scales at 10,700 lbs dry weight. The Forest River XLR Nitro 407 comes in at 29.0 ft with a dry weight of 13,900 lbs. That gives the Heartland Milestone 370FLMB roughly 9.0 extra feet of length.

The Heartland Milestone 370FLMB sleeps 6 while the Forest River XLR Nitro 407 accommodates 9. Slide-outs play a role in livability: the Heartland Milestone 370FLMB has 3 and the Forest River XLR Nitro 407 has 1.

For boondocking enthusiasts, tank sizes matter. Fresh water capacity goes to the Forest River XLR Nitro 407 at 93 gallons versus 74 gallons. Solar-wise, you get 250W on the Heartland Milestone 370FLMB and 400W on the Forest River XLR Nitro 407. Battery banks are 250 Ah and 100 Ah.

At $173,000 MSRP for the Heartland Milestone 370FLMB and $173,000 for the Forest River XLR Nitro 407, the Forest River XLR Nitro 407 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.

The numbers tell one story, but the feel of a floor plan is personal. Schedule a walkthrough before you decide.