Roof replacement on camper with fiberglass exterior

I gutted a 24' trailer. The interior removal isn't that bad, nor the framing replacement. If you have some type of laminated fiberglass/wood combination, it will be tricky to fix. One of the better ideas I saw for this was positioning the sidewall within a few feet of a garage. The repairer then used braces from the garage wall to pull/push the sidewall panels together and back onto the frame.