We bought the Poly Pro # cover from Escape Nov. 2019 , so it was barely a year old and now the top has torn apart in the wind. From one end to the other.
Cheap covers. If you want something that will last call Calmark. Something constantly exposed to the elements in the marine or RV environment needs to be Sunbrella fabric in my opinion.
I also got 1 year out of an ADCO poly pro cover some years ago. I got 6 years out of the Tyvek one, although it did get a few small tears in it. The Calmark was still good at 6 years when I sold it.
You do need to do what you can to prevent the wind from billowing the cover, and cover all the sharp corners.
The PermaPro Is a much better cover - I have had both PolyPro and PermaPro on different trailers. it is more of a good quality tent material instead of the glorified Tyvek of the PolyPro. And the PermaPro has a lifetime warranty too.