On Tuesday, May 21, 2019 at 10:09:54 PM UTC-7, Tango Whisky wrote:
Trailer tops are made from polyester resins (like boat hulls) - different animal.

Let me try to de-r.a.s. this.

Nobody was discussing heat or UV dammage to a trailer trailer top.

AFAIK Eric is asking why a fiberglass top trailer may be less of a problem with heat inside damaging a glider than an aluminum top trailer.

(Careful now r.a.s. don't guess, Eric may be correct. And no, the roof of an aluminum trailer feel hotter but that is a thermal mass and conductivity effect).