We have tried 3 different covers. Each lasted about 3 years.But the thing I really didn't like about them was they let the water through and when you took them off the RV was really dirty. So for the past several years we used plastic tarps. We have a 26ft TT so I bought a 30 x 20 tarp. It was about $60. I then bought some 2" straps that go completely over and under the RV. Don't try to keep it on with just the gromets although you will need to use some to keep the edges from flapping. Anyways we usually get 2 years out of each tarp and the best thing is when you take them off the trailer is still clean.So do the math.Buy one cover that last for 3 years at $350 that lets the dirt in or a tarp that lasts 2 years @ $60 that keeps the dirt out?