I have a 10X20 portable carport over mine I bought on sale at Harbor Freight. I like it better than a tight fitting cover as I am in and out of the trailer working on it frequently. Also, around here (Florida) a tarp would trap moisture, I suppose a real cover would not. The carport can be had for around a $100 with some careful shopping and waiting for a sale at several places like Tractor Supply in addition to HF. It does have to be tied down, I'm telling you what I know. Just today in a severe thunderstorm it almost took off despite being tied to concrete blocks at each corner.