2025 Keystone Montana 3855BR vs 2025 Keystone Alpine 3700FL

Detailed Comparison

The 2025 Keystone Montana 3855BR goes up against the 2025 Keystone Alpine 3700FL in this detailed comparison. Each has distinct advantages worth considering.

Starting with size, the Keystone Montana 3855BR measures 28.5 ft long and tips the scales at 12,000 lbs dry weight. The Keystone Alpine 3700FL comes in at 37.5 ft with a dry weight of 10,800 lbs. That gives the Keystone Alpine 3700FL roughly 9.0 extra feet of length.

The Keystone Montana 3855BR sleeps 6 while the Keystone Alpine 3700FL accommodates 4. Slide-outs play a role in livability: the Keystone Montana 3855BR has 4 and the Keystone Alpine 3700FL has 2.

For boondocking enthusiasts, tank sizes matter. Fresh water capacity goes to the Keystone Alpine 3700FL at 72 gallons versus 67 gallons. Solar-wise, you get 300W on the Keystone Montana 3855BR and 450W on the Keystone Alpine 3700FL. Battery banks are 300 Ah and 350 Ah.

At $97,000 MSRP for the Keystone Montana 3855BR and $91,000 for the Keystone Alpine 3700FL, the Keystone Alpine 3700FL saves you $6,000. With only a 7% 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.

Ultimately, both rigs have their merits — test drive each one and see which floor plan speaks to your lifestyle.