Is this a Riverside "Retro" unit? I'm curious because at their
webpage they don't say what the sides are made of; the below pic looks as if the skin is some kind of
plastic. I thought they used aluminum panels like the old trailers they're sort of modeled on.
Either way, that part of the skin is so badly torn/stretched that it looks to me like you'll either have to replace the whole panel or put some kind of a camouflaging "ring" around that area. That $300.00 repair tag is soundin' pretty good to me if it includes such work!
