2025 Keystone Alpine 3700FL vs 2024 Keystone Arcadia 378RL

Detailed Comparison

Both the 2025 Keystone Alpine 3700FL and the 2024 Keystone Arcadia 378RL have loyal followings, and for good reason. Here's an objective look at how they measure up.

In terms of footprint, the Keystone Alpine 3700FL stretches 37.5 ft while the Keystone Arcadia 378RL spans 34.5 ft. Weight-wise, the Keystone Alpine 3700FL is the lighter rig at 10,800 lbs versus 13,600 lbs.

The Keystone Alpine 3700FL sleeps 4 while the Keystone Arcadia 378RL accommodates 8. Slide-outs play a role in livability: the Keystone Alpine 3700FL has 2 and the Keystone Arcadia 378RL has 1.

For boondocking enthusiasts, tank sizes matter. Fresh water capacity goes to the Keystone Arcadia 378RL at 75 gallons versus 72 gallons. Solar-wise, you get 450W on the Keystone Alpine 3700FL and 500W on the Keystone Arcadia 378RL. Battery banks are 350 Ah and 200 Ah.

At $91,000 MSRP for the Keystone Alpine 3700FL and $87,000 for the Keystone Arcadia 378RL, the Keystone Arcadia 378RL saves you $4,000. With only a 5% 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.

Both options have earned their place in the market. Your trip style and budget should be the final tiebreakers.