TurnThePage wrote:
I can't prove it, but I think fiberglass walls block sound better. I can hear a gnat fart through my aluminum skinned trailer.
Generally, this would be true. Aluminum has a much higher resonance than fiberglass. A fiberglass sided trailer typically has the whole wall sections, including the insulation, bonded together. An aluminum trailer may have spun fiberglass that has settled within the wall frame, allowing an open space between siding and interior panel. What you have then, is a rigid drum.
Fiberglass delamination is much harder to repair than a failed frame in an aluminum sided trailer, from water intrusion. Wooden frames conduct cold and heat slower than aluminum. There is usually no quality difference between the two construction methods, it is more to the price-point and model designation from the mfg.
Buying a travel trailer based on the siding applied is not the correct goal, IMO. I would be more concerned about the floor's construction and the layout of the particular trailer.