Cover the AC unit.
My TT is stored at the ocean. I noticed another Jayco (2008) owner who stores his at the same place, putting an AC cover over his AC. I asked him about it, and he said he had been doing it for years after having replaced an AC unit on his last TT. I went to my dealer across the street and asked him. He told me not to, that it would trap moisture inside the AC and that it wasn't a good idea. I happened to stop at camping world, and asked there salesman. He said that I should cover it! In driving back from camping world, I went by several camper storage areas, and saw at least 500 TT, and 5th wheels. Not one that I could see as I was driving had a cover over the AC unit. What gives? BTW, I didn't buy a cover.