I thought about getting a cover for our 2013 Trail Runner, but after reading posts here, and a couple of my neighbors' experiences, I decided not to waste my money on a trailer cover.
Mold issues . . . and wind damage to the covers makes it a non-issue for me!
We park our trailer right next to our house (garage) when not in use . . .
Foot note: I have a new truck since this shot was taken . . .