Gary RV_Wizard
Site Team
Since we don't even know what "bushings" are in question here, I am reluctant to agree or to disagree.
On this ADL-120 rear suspension the "adjustable axle alignment" is provided by 'alignment blocks' which are just some special washers which are welded into place over an elongated hole in the 'equalizing beams' on the sides of the suspension, thus allowing some forward/aft adjustment on one (or potentially both) sides. To re-adjust you need to grind off the old ones and weld new ones on.In the pdf Chris provided a link to, bullet #2 is "adjustable axle alignment". Yours likely uses eccentric bushings. Most rear suspensions have an adjustment of some type.
I submit the axle being out of alignment caused premature bushing wear.