Frp
It seems that the term FRP is used for many materials. The FRP that I used is made by Fibertech is Spokane Wa. I think they have a plant in Ohio also. I used 1/2" for the walls and 3/8" for my roof. My FRP has fiberglass on each side of plywood with no foam. It guts just like wood. It sounds like yours has foam. Have you tried to contact Haulmark and see if they might have more info on what they use? I know that Renagade uses the same as mine except thicker, I think 3/4". They don't use a frame and I used 2" sq tube for the frame. I spent a lot of time putting 3 coats of epoxy on all the raw edges to prevent water damage. Good luck
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