On our coach, the deteriorated bushings were easy to spot. Each axle has four large leading supports - two on each side, There are also two side-to-side supports that look the same. Maybe 30-inches long, square tubing, rings on each end. Ten total.
When I first checked the bushings, I went under, grabbed each one and shook it. On some, they moved a couple of inches. Some moved less, and crumbs of the old urethane insert fell out. Others seemed secure.
I replaced all of them. Were I to do the job again, I would be sure to only remove one support at a time. When I removed two, the axle shifted and it was a job to get the supports back in. Also, I would be more liberal with just cutting the bolts with a thin metal-cutting disk and knocking the pieces out.
Make sure you have the new bushings in hand before you start!
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Matt B
1998 Foretravel U-320
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