Raising the tag axle is "optional", not a "necessity". So why are you "stuck"?
With that said, 2 things come to mind:
1) The tag axle MAC valve is old and frozen up, or it isn't getting elect due to a blown fuse, etc.
2) this happen to us on one of our tag axle Monacos: a mud dabber clogged the exhaust port on the manifold where the tag axle air bag air is exhausted(above rear differential housing).
We hope this helps
CURRENTLY MOTORHOMELESS!-Past MHs: 02 Monaco45'Sig,00Monaco43'Sig,99Monaco42'Exec,98Mona co42'Sig,98Newmar38'DSDP(pictured),88FW26'Jamboree .