Originally Posted by garry
I think the problem was fixed by 1978 and the seperation was unique to the rear bath models.
The search will help with the answer and other frame related problems to look for.
Simple answer is to step on the rear bumper and if it goes down even 1/4 in from the body you have a problem.
The problem occured after AS went to a smaller frame circa 1970 and occurs in all models longer than 25' or so up into the early 80's. Prime cause appears to be (re Andy at InlandRV) poorly balanced running gear aggravated by loading (rear tanks if carried full could do this).
Many 70's Amabassadors and Sovereigns do not have the problem but some do, even some with center bath. Center bath models were not very popular in this time frame so their population in the problem group is rather small.
AS has two tech notes for fixes. The 'elephant ear' fix reinforces the frame from the rear. The axle plate fix reinforces the axle mounting plate which has buckled in a few cases.
Besides the 'tromp in the rear bumper' test also look for telltale signs of skin warping near the center of the trailer.
Don't forget to note how the wheels fit in the wheel wells as an indicator of axle condition. Also note that overrated for load tires may aggravate vibration problems.