2025 Keystone Cougar 368MBI vs 2024 Forest River Sierra 321RL

Detailed Comparison

The 2025 Keystone Cougar 368MBI goes up against the 2024 Forest River Sierra 321RL in this detailed comparison. Each has distinct advantages worth considering.

Starting with size, the Keystone Cougar 368MBI measures 29.0 ft long and tips the scales at 13,000 lbs dry weight. The Forest River Sierra 321RL comes in at 28.5 ft with a dry weight of 10,900 lbs.

The Keystone Cougar 368MBI sleeps 10 while the Forest River Sierra 321RL accommodates 9. Slide-outs play a role in livability: the Keystone Cougar 368MBI has 5 and the Forest River Sierra 321RL has 1.

For boondocking enthusiasts, tank sizes matter. Fresh water capacity goes to the Keystone Cougar 368MBI at 89 gallons versus 76 gallons. Solar-wise, you get 600W on the Keystone Cougar 368MBI and 100W on the Forest River Sierra 321RL. Battery banks are 100 Ah and 150 Ah.

At $155,000 MSRP for the Keystone Cougar 368MBI and $158,000 for the Forest River Sierra 321RL, the Keystone Cougar 368MBI saves you $3,000. With only a 2% 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.

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