Welcome to the forums -- great trailer choice!
What's your purpose for the tarp? If it's to keep out water, I think you'd be a lot better off using
Foil Tape to seal seams that leak. Definitely put some over the top of both the front and rear windows where all the seams come together -- that spot is famous for leaks. Search this forum for "hillbilly leak test" if you're trying to find and seal lots of leaks.
I haven't seen trailers unwrapped after being tarped, but there are a lot of reports of damage. As the tarp is blown around by the wind, it scrapes off corrosion, which is VERY abrasive. Your aluminum walls in that year have a thin layer of pure aluminum that can be worn through if exposed to a lot of abrasion.