Just a thought, was the windshield replaced through your insurance? If so, don't bother dealing directly with Safelight RV, just call your insurance company and ask them how long a PROPER repair is supposed to last?
Generally "stress cracks" are caused by a protuberance in the window channel, or the window being too firmly glued in by the installer, or from going over a curb, or possibly jacking the RV incorrectly. If there was a problem with the window channel, then the installer should have caught it.
I would go physically to a Safelight RV location, preferably the one that did the install (may not be possible if you are on the road already) and ask them face to face to correct the problem.
P.S. Why was the original windshield replaced? Chips/dings? Or a crack in the same place as the new one? If it was a crack in the same place, then you may have a frame out of shape problem or front cap settling problem, possibly caused by broken front cap supports etc.
Good luck in getting resolution, and please keep us informed of your progress!
Scot & Laura Kellersberger
2001 Newmar 4 wheel drive Dutch Star 3891, 2005 GMC Canyon. Demco Tow Bar & Baseplate U.S.Army (ret) 1985 - 2006