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I agree that I will have to take it back....but the question remains about the correct air pressure for the seals.  Mine are all over the place, and I suspect most coaches are the same way.  

Also, maybe a smart guru has already figured out how to solve this problem.  I am beginning to think that some sort of vertical pillar is needed to support the middle of the slide when extended.

20 PSI +/- 2 PSI

This time of year look for leaves, acorns, pine needles, and other debris between seal and top of the slide out.