I don't know if this will help or not, but I am having severe tire wear on one tire only. I found this website which helps diagnose trailer tire alignment issues:
http://www.centrevilletrailer.com/how-to/trailer-axle-alignment-trailer-tire-wear/
The straight edge test showed I have a bent spindle. My axles are rated at 3000 lbs. I contacted Al-Ko with the axle number and was told that due to the buy out by Dexter, a number of axles are discontinued, including mine. They gave me a number for a direct bolt on replacement for a 3500 lb axle, and I am awaiting deliver of those to do it myself. You may find that your lighter weight axle is no longer made.
