wrote


so there is none, but if they were placed flat on the roof of a trailer,
the few extra inches of surface area wouldn't account for much, and
certainly not enough to outweigh the panels' use.



the ones I got are 1/2 inch thick and weigh under 15 pounds each ( the
shipping weight was 15 including packing and fudge factor )

The way I mounted them won't give me maximum output but will give them
maximum protection from accidental damage .... I worry about that more than
the panels "wearing out" before paying for themselves

( I ran my first
travel trailer into the corner of our house the first time I took it on a
trip, the second one was smashed into a million pieces, and I was lucky to
live through the process, when a double semi-truck filled with gravel
literally drove through the trailer, the current trailer had it's roof
railing torn off on it's first trip to fish Hot Creek about 8 years ago { I
HAD to be under a tree} and I poked a small hole in the rubber roof on it's
latest journey when I just HAD to park under a tree at Hayspur while there
to fish Silver Creek ...trust me you don't want to be my trailer :-)