Hi Tuga,
I just take my coach in to a shop annually to have everything on the bottom checked. Air bag inspection is part of the process. If there is any concerns as to their condition we just replace them. They don't endure the same abuse as tires so I think they last longer.
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1993 Newell 45'#316, 1976 Trans Am 455, 1967 GTO, 1953 Chevrolet 3105 (panel truck),1952 Chevrolet 3600,1969 Airstream Overlander. Always fixing something!
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