Our Travel Trailers have always sat outside without heat and without any covers during the harsh winters of Western New York.
We winterize the water system and remove the battery. The fully charged battery gets stored in a heated basement till we de-winterize in early May.
BE CAREFUL when disconnecting and reconnecting the battery to avoid shock! Can be very dangerous, make sure you know what you are doing!
In addition to the above, we place drier sheets all over the inside of the trailer, seems to keep out critters and bugs.
This has served us well for the last 16 years.
K. Scharf
Apex 215RBK
Just love our new camper!