The FRP has been used for many years in the trucking industry. A 48 or 53ft trailer made of the FRP and one made from the Aluminum sheet and post will weigh about the same. The FRP is said to be stronger and has the advantage of being smooth. However if the FRP ever gets water in between the bonded fiberglass and into the plywood you are in for real trouble. We have had several trailers develope a leak at the top seam and by the time we caught it the damage was already done. Repairs can be expensive and difficult to blend in. With the sheet and post aluminum you can always replace panels.
Wick
2006 30ft Show Hauler "Almost Done"
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