On our '17, I don't see any discernable bow in the rear window. Ours appears to be completely flush so it might be something to put on your punch list for the next visit to the dealer.
As for the floors squeaking, yeah it seems to be an issue with many.
For us, I notice it a LOT more when the stabilizer legs are down vs. not and I am assuming it's just caused by the way the frame/floor flexes when they are down. It seems to be the most noticeable from front (bedrm) to back (livingrm) along a line in the center of the trailer.
Two spots in the bedroom at each corner, one between the island and the coat/storage cabinets on the bathroom wall and again in the LR on the other end of the island are the most noisy areas.
I was told by a tech at our dealership that it is the same area where Jayco runs most everything under the floor including ducting, pex, electrical, etc. and in order to do so, some of the cross bracing underneath is not as robust in those areas as in others, thus allowing more flexing of the floor.
We have just used the "cheating husband" technique by tiptoeing around known "squeaky" spots when others are sleeping!
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2018 GMC Sierra 3500HD Denali 4WD LB SRW 6.6L Duramax
2017 Jayco Eagle 330RSTS
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