The other day while driving my 2000 31ft Itasca Spirit I noticed the cabover edge on the drivers side flexing up and down while on the road. Is that normal?. I've had class A's in the past
It is probably not "normal", but after a lot of bouncing over rough roads, things do work loose. Many older class C's develop leaks in that area and it can be a constant battle to keep up with them.