I was told that the fiberglass on a Bounder is 3/8 thick. I know the fiberglass on my 2017 Jayco is not anywhere near that. The fiberglass roofs are superior in that you do not get black streaking down the side of the coach, but you need to be careful with the edge area's from limbs or impact damage. I walk on mine without any problem but not near the round over edge area. On my rig the roof is crowned. Another bonus is you don't get that dirty moldy look that the elastic roofs have. I think that it would lighter too.