I mentioned this once before, we saw two units (TT) being delivered (non JAYCO) where all 4 wheels left the ground when the drivers hit a bump because they were going so fast.
I'm willing to bet those units were in better shape when they left the factory then when they arrived at the dealer. The same probably happens to some of the JAYCO units, unfortunately some dealers don't make the corrections before selling them.
PINNACLE 2015 38FLSA. aka: "Roam Sweet Home"