We kept most of our trailers in the barn for many many years. They got dirty, but no weather damage.
Now that we live in the hot sunny rainy state of Florida, I've been keeping the little trailer on a storage lot. For two years it was covered with an expensive made to order cover from CW, ADCO made to order.
The first year was no problem. I used cut up pool noodles for the gutters.
I just took it off the other day, going into year 3 for the cover. It was torn over the ladder, which I should have padded. One of the noodles fell off and there was a hole. There was rotting on the roof material and lots of mold and algee under the cover. ADCO wants pictures sent. Supposed to be four year warrenty.
I just cleaned the roof and ordered one of the Elements Covers. This time a little bigger so I'll have room for padding stuff better.
So I spoke with the ADCO people today and they are honoring their four year warranty and sending me a new cover. Very happy with the good customer service. I will keep the other one I ordered for a spare.