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...
Again, get an independent tech to do the inspection and save your self money and get an honest report. RV dealers are not known for being honest. Any tire shop can mount the tires, in fact I would avoid RV specific dealers for this.