Most likely, there is no reverse wire run to the rear of the trailer, but some are. What unit are you looking at?
Usually, the cameras are wired into the running lights, so you can use the camera any time, not just in reverse.
Covers are a pain, but covered parking is worth it.
It will need washing, waxing, and treatment of the roof and touching up of the sealants on the side and roof.
Off both subjects, hope you're looking at a TH that is light enough for your 3/4 ton truck. Always want everyone to be safe.