At the end of last fall we purchased our first in a long time travel trailer, and the first that we will be towing anyplace. Previous trailers were parked on site in campground and never moved. Anyhow...
I'd suggest you hire someone to completely inspect it, dismount the tires and mount, and accomplish the rest of the work involved. If you can't/won't do any of it yourself, don't start balking about the price of preventive/scheduled maintenance. Getting cheap on maintenance with an RV is a sure fire prescription to pay much more later.