Slow, the airbag rear end on my 28' AS 1984 was done by ACS and they still support the system. I replaced mine last year as they where dry rotted. As long as they hold air and don't look to be deteriorated they should be good for a long, long time. I think mine where original.
I had mine done by the local truck suspension outfit in Columbia, SC who are an ACS shop.
Not sure what year your coach is but mine came with 19.5" rubber.
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Glen Coombe AIR #8416
1984 28' Funeral Coach
Former Rolling Showroom & PuttLab (now party bus)
"I'm not an expert. But I did sleep in an Airstream last night."
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