he rear sag in the frame ? did 2 here last year. Jackson has a KIT !!!!
if you have rear sag also need to check floor side to side for sagging wall support gussets ( kit also available ) for rear = jack up so wheels dangle , jack stands at extreme rear of frame , add weight ( I used sand bags ) at center of axles , heat where buldged on bothg side and allow to settle out . whatch the heat closely so as not to have frame bend upward once is straight install reinfirc kit from AS and weld in place . is plug welded to keep distortion down . this is a job for a skilled metal worker.
if you have sagged side gussets will show with a straight edge laid across floor wall to wall should lay flat ? on the last 1 I did I had a 1 1/8" drop on pass side = body had dropped on pass/ side was a job to fix but trlr was already gutted to repair rear frame. good luck , feel free to contact me for pics if you think it will help .
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