If the rig has a John Deere chassis they now come under freightliner so although not all chassis parts are available or even made,alot still are. Give the freightliner help line number a call,can't remember it off hand but there's a sticky in the freightliner chassis forum.
Have last six digits if chassis VIN handy and see if they can help you out.
1987 Fleetwood Bounder 34'
*~*Stationary Fulltimers for now*~*