....I looked at Inovator Trailers in ELkhart that makes a type of FRP trailer...it had a noticable belly in the roof-thanks to my tape measure-I convinced the salesman also....had it rained while I was there-it would't have taken anything besides a ladder to prove my point. I truly believe that unless there are roof trusses/bows or tubing frame of aluminum or steel-a box will have a belly sooner or later-snow and ice will be a concern as the added weight will increase the belly with time....The insulation issue is still nagging on me-an installer in Hamilton is supposed to call Wednesday...Our local OTR Trailer repair shop uses spray can foam for small repairs and has access to larger quanities at about $2.00 a board foot retail. Material cost of the foam is about $0.30 a board foot approx. as per the manufacture. I'm waiting for local installers to contact me-so far there is only one in the tri-state area.....geof-Near Cincinnati
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