Anne,
The Airstream uses a unique rubber bushed torsion bar suspension where the
rubber is contained inside the four corners of a square tube. (And a second
square tube is inserted at a 45 degree angle) Yes, the rubber can
deteriorate, which can only be remedied by replacing the axle assembly.
The good news is that the axle has a much longer life than one would expect.
Also, the replacement cost is not astronomical, but why replace it if it is
still OK?
Some dealers/service facilities seem to be over zealous in recommending
replacing axles.
The way the suspension works is by supporting the wheel on short "moment
arm" attached to the axle torsion bar (inside square tube). The bar twists
(compressing the rubber) and the wheel on the end of the arm goes up and
down.
If the rubber is shot, then the trailer will ride lower to the ground I do
not know what the specified tollerance is. As long as the trailer has the
proper ground clearance (the arm is at the proper angle - and height), you
are fine.
I would call the Airstream factory and find out what the specification is,
and how to measure it. (It is just a simple measurement with a ruler or tape
measure.) Then you will know the true condition of your axles.
Good luck,
Oliver Filippi
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