You might contact Kelderman Air Suspension in Iowa. They build air suspension systems for MDT vehicles. The use to have a kit for the F-53 Ford chassis. Not sure if they make one for the P-30 GM/Workhorse chassis. Sorry I don't have their contact info readily handy.
Mike H
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Mike & Debbie
2003 36' Monaco Cayman
2007 Saturn Vue "pusher"
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