Only in New England can it go from -16 and two and a half days later it is 50. It was warm enough in my pole barn to work on the trailer today.

I stated by placing sheets of warmed soundproofing material comparable to dynamat on the inside of the skin, staggered as total coverage is not needed.
Then I sprayed the ribs with a rust preventing underbody spray by Rustolume.

This made a huge difference in the reverberation of the side panels and will contribute greatly to the soundproofing of the finished trailer.
My trailer has a back wall that is installed 5' from the back door of the trailer that gives me a kind of porch. It has an RV door in the middle of the wall. I had planned to move the wall back 4' toward the back of the trailer... BUT when I took off the plywood I saw that it is actually steal framed welded to the trailer base and not stick framed like I originally thought..

I am surprised on the quality of the trailer build... other than the wiring.

I plan to soundproof all the walls and coat the ribs with the spray...
After much research and a little bickering on this site from others...

I will be layering my insulation.
First foil-foam-foil to fill out the space than some type of thermal decoupler attached to the metal ribs to extend the wall cavity out another 2" for the pink or blue foam. Then I will replace the plywood followed by one more layer of foam covered with acoustical fabric for the finished wall. The end result I am working toward will be an exceptionally well insulated black trailer that will be easy to heat and cool and will be very quite. Because I might be hunt'n wrabitts!
Thoughts... Suggestions???
