2025 Forest River Sandpiper 3660MB vs 2025 Jayco Eagle 321RSTS

Detailed Comparison

Both the 2025 Forest River Sandpiper 3660MB and the 2025 Jayco Eagle 321RSTS have loyal followings, and for good reason. Here's an objective look at how they measure up.

The Forest River Sandpiper 3660MB measures 35.5 ft in length at 8,600 lbs, compared to the Jayco Eagle 321RSTS's 42.0 ft and 15,700 lbs. GVWR ratings sit at 11,500 lbs and 19,400 lbs respectively.

The Forest River Sandpiper 3660MB sleeps 4 while the Jayco Eagle 321RSTS accommodates 7. Slide-outs play a role in livability: the Forest River Sandpiper 3660MB has 1 and the Jayco Eagle 321RSTS has 2.

For boondocking enthusiasts, tank sizes matter. Fresh water capacity goes to the Forest River Sandpiper 3660MB at 94 gallons versus 92 gallons. Solar-wise, you get 300W on the Forest River Sandpiper 3660MB and 300W on the Jayco Eagle 321RSTS. Battery banks are 250 Ah and 250 Ah.

At $105,000 MSRP for the Forest River Sandpiper 3660MB and $105,000 for the Jayco Eagle 321RSTS, the Jayco Eagle 321RSTS 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.

Take these specs as a starting point, then go see them in person — there's no substitute for stepping inside.