Mine seems to air the front before the back. I think there has to be a certain amount of air pressure in the tanks before the rears will overcome the valve seat and fill, but no matter what the cause, like you I end up with a level coach after a few minutes. BTW it is a 10 bag like yours. I choose not to worry about it.
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2002 Monaco Executive
Cummins 500ISM (11L)
Castle Rock, CO
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