Just a thought.
Wow! you have to do the other side. Had my HiLo dealer and the repair place tell me to do this. When you have the inside siding exposed coat it with liquid Bondo to seal up and pint point holes you can't see. Industrial respirator and good ventilation needed. You might have to brace inside to make the RV more rigid. Any metal that was exposed was coated with Rustoleum. DH used heavy duty liquid nails. Cheapest at Walmart. Some have used Locktite caulk. Use a generous amt. One tube per sheet of material. DH used spray foam to seal up any gap areas. Our trailer went to a Veteran that needed a place to sleep after he got out of the service. Our HiLo Technician reports he hasn't had to do any repairs on our 1990 HiLo. It is parked in his back yard.