I replaced the rubber springs on my tag axle a couple of years ago. Mine were not broken just starting to crack. Called MorRyde to order them, replaced both sides myself and a friend. If I remember right it was around $600.00 for both springs. Ask if there us a upgrade for more weight carrying capacity.
Chuck & Teri, 1999 35 ft. Dolphin 5350, F53 Chassis with tag axle, Chassis build date 1/99 in Mexico, Banks System, Trans Command, Air Lift Air Bags on rear, Koni Shocks, Blue OX TruCenter, TigerTrak track bars front and rear, Roadmaster 1-3/4" rear auxiliary sway bar, 2013 VW Passat TDI SEL Premium, 1994 36 ft. Avion 5th Wheel. FMCA #F430129