2024 Keystone Montana 3791RD vs 2025 Keystone Cougar 354FLS

Detailed Comparison

Before committing to the 2024 Keystone Montana 3791RD or the 2025 Keystone Cougar 354FLS, it pays to understand exactly where each one shines and where it falls short.

Starting with size, the Keystone Montana 3791RD measures 40.5 ft long and tips the scales at 10,300 lbs dry weight. The Keystone Cougar 354FLS comes in at 34.0 ft with a dry weight of 14,200 lbs. That gives the Keystone Montana 3791RD roughly 6.5 extra feet of length.

The Keystone Montana 3791RD sleeps 10 while the Keystone Cougar 354FLS accommodates 6. Slide-outs play a role in livability: the Keystone Montana 3791RD has 1 and the Keystone Cougar 354FLS has 4.

For boondocking enthusiasts, tank sizes matter. Fresh water capacity goes to the Keystone Cougar 354FLS at 100 gallons versus 68 gallons. Solar-wise, you get 550W on the Keystone Montana 3791RD and 200W on the Keystone Cougar 354FLS. Battery banks are 300 Ah and 150 Ah.

At $72,000 MSRP for the Keystone Montana 3791RD and $68,000 for the Keystone Cougar 354FLS, the Keystone Cougar 354FLS saves you $4,000. With only a 6% 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.