Welcome to the forum. I can't recall any major discussion about this separation issue here on this forum but it may well appear to be a problem. The backs of many Keystone RV's are "floating" and it feels like the back is not attached to anything unlike the sides. If you were to push on the back, it gives and flexes which is "normal". It is held in place along the top, sides, bottom and around any windows but that is about it I believe. If this is what Keystone told you then, it is normal -- just doesn't feel like it is though.
On our Cougar 5er, the back does the same thing.
Perhaps some of our Avalanche members will chime in and give their perspective on this issue.
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2008 Cougar 5th Wheel 27RKS
2005 2500 GMC Duramax
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