OK. I'll keep a look out for cat scales where I can just measure one wheel at a time.
I went back and checked the tread wear difference; it's only 1 mm diff in the centre. And measured more accurately the distance difference from axle to frame: 1.5cm. These #'s don't seem too bad after all.
Also checked the axle's relationship to the frame and it seems pretty true, as best I could tell +- 1 cm.
Wayne's remarks sound about right. At least I hope the wear is "normal" after about 15,000 km. I also noticed that a lot poorly maintained highways have some pretty deep ruts on the right side of the right lane which would help explain the edge wear.
So I'll rotate, and probably up the pressure to 65psi on both. That will mean a lot more banging in trailer, but hopefully might extend the tire life.
These Marathons are doing pretty well otherwise.
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