No molded
fiberglass trailers in that size range are true off-road grade. But with a little work and a willingness to fix and improve things as they fail, most any are perfectly serviceable for the use described.
Based on my
Scamp experience, weaknesses include cabinet hardware and 12V wiring. Our most spectacular failure was the silverware drawer falling out on a particularly rough side road. The drawer itself was unharmed, just the slides and stop came loose. I put it back together when we got home with stronger hardware, a better stop, and a bit of Loc-tite. No more issues.
Ground clearance can be an issue with many small trailers. We had to very really careful on dips and washes with our stock 13’
Scamp. You may want to swap the stock
axle for a taller one. Flexi-ride is a premium choice, and it allows you to adjust the ride height.
Rock chips will quickly pit the lower front shell on gravel roads. Pickup bedliner can be used as a preventative. Some versions are tintable to approximate the shell color.
Oliver is the closest to a true off-road molded trailer with very high build quality, but the smallest model is 19’ and quite expensive. I chanced to meet the owner in the middle of a hunting trip, and his unit showed evidence of heavy off-road use.