Hi Matt
My trailer, now 3 years old, In its first year Had the same tire wear problem.
The wheel was wobbling. If you jack up the trailer and put a screwdriver on a couple of 2x6's, With the end of the screwdriver just touching the side wall. Give the wheel a spin and see if it turns true.
On mine one wheel was wobbling about 3/8" and the other about 1/4"
I was sure I had bent rims But I had very few miles on trailer and had not hit anything or bounced over any curbs.
I called the dealer but of course he said I must of hit something or the axle is bent.
I did a lot of measuring and took pics and videos.
But he was not satisfied and wanted a tire dealer to say the rims were bent,
I took the wheels off and went to McKee Tire here in Innisfil The tech put them on the balance machine and right away said it was the tires themselves and not the rims.
There were belts or whatever broken in the tire causing the wobble and wear.
After a call from McKee My tires were replaced by the dealer free of charge
Something to look at
Cheers
Rick