Here are a few links to suspension suppliers for RVs:

Air Ax Suspension System Air spring suspension systems.


Air Lift Company Do-it-yourself air spring suspension system kits.


Bilstein Premium gas pressure shock absorbers and a new steering damper for RV’s.


ipd Aftermarket suspension systems, including anti-sway bars.


Kelderman Manufacturing Air spring system for an easier ride, designed for pickup trucks and trailers.


MOR/Ryde Inc Rubber leaf springs and rubber suspension systems for motorhomes and travel trailers.


Reyco/Granning Tuthill Transport Technologies offers an air ride suspension system for motorhomes.