Could be a flying object. It could be "spider web" cracking, but spider web is usually more of a micro crack. Yours is fairly large, which might be from an impact.
The bottom half (less severe looking) is more reminiscent of spider web, but the top half looks more like impact.
Spider web cracking in fiberglass (boats) is fairly common, and usually the result of inadequate support to keep the fiberglass from flexing and vibrating. I would assume RVs are no different in that regard.
Since this is a Thor, anything is possible.
__________________
The only thing that works on a RV is the owner...
|