Uneven tire wear 2019 Micro Minnie 2108DS

[tinglett]

I thought I'd post this here as I suspect it's due to an issue with my dual torsion axles. I noticed some uneven tire wear on my rear curb side tire as can be seen in the first photo below. The other three photos are the other tires, the 2nd being the tire on the same side, and the 3rd and 4th being the other side. These tires are 4 years old and I do plan to replace next year, but I probably should figure out this issue first. They only have about 2800 miles on them.

I measured distances between the axles and the curb side does have the axles 1/4th inch closer together than the street side, 34 vs 34.25. I'll need to figure out how to adjust that, but am wondering if there may be other causes I should check. I always have a TPMS on the wheels and am not aware I've ever driven on them with overly low or high pressure.

I haven't attempted to measure the front axle to the tongue to see if it's square with the TT. That'll be a tricky measurement to make, but I'll attempt that. For the moment I'll assume that is correct and the rear axle might be slightly forward on the trouble curb side. Would this explain that wear?