Wow proud ol gal isn't she..Big concern for myself would be the running
gear starting with tires,they are not easy to change so about the last thing
you want to go bad. I would invest in towing insurance, from Good Sam or???
Bottom line, check tire dates..over 6 years..they should go.
If you want the water to work, disconnect inlet to hotwater tank and plug it, see if everything else is OK.
Good luck, make a nice project
Jim in Pima Az, enjoying our 1975 31 ft Airstream Sovereign