I have a Keystone Passport Ultralight. 30ft, rear living setup. Dry weight around 5500 lbs so it is easily towed with an F150. I have pulled this one several thousand miles. I got this one after Hurricane Harvey for $1500 from an insurance company because it was considered totaled. it only had two water spots inside and needed about 2ft2 of floor replaced. These campers are made using 1.5 square aluminum tube and have ridged insulation foam sandwiched between the tubing with 1/4” plywood. I was able to repair the floor for $50 and sealed the puncture in the roof using Eterna bond tape. Best thing for sealing vinyl camper roofs.
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Additional note - check your state regulations for retitling a totaled vehicle. Texas doesn’t allow it and that is why I got it so cheap. Brought it to Louisiana and had it inspected and retitled before I even started working on it.