This cover fit out 28 ft Prowler travel trailer very well - although I will say there wasn't a lot of extra room to spare so I would hesitate to put it on a trailer that is any larger. Once installed, it seems very secure with straps that go under the trailer. The only reason I didn't give it 5 starts is because the side and back panels are a little flimsy - the rear bumper already cause a hole just from the process of securing the cover onto the trailer.