Recently picked up my Caravanner which had been sitting a long long time.
We took tires mounted on our rims, Chevy/Toyota 6 bolt. If your is original, it will have split rims most likely and you probably won't be able to get anything done with them.
Didn't have working brakes either and we didn't look at the bearings. We were on a small island and were afraid we'd never get a new grease seal if we needed one, so we just went with what we had. Stopped several times to make sure the hubs were cool.
I'd have something in mind for securing windows and/or window frames. Big one is the door: I'd make sure I had some way of tying it shut as a backup to the lock.
We did temp lights as well.
Should be a 2 inch ball.
Took it slow and had no problems with the tow.
Welcome to the club: you must post pictures to maintain your membership!