OK. Thanks Bobby.
And despite that really obvious camber in the axle, the tire does seem perpendicular to the ground. I don't have a flat surface anywhere around here so I just leveled the trailer with the jacks, taking as little weight off the wheels as possible. Then put a unwarped 2x6 in front of the tire, leveled that and laid my big carpenter square up against the side of the tire. It was a perfect 90 degrees as best I can tell.
Not sure how accurate that is, but I'll accept it. So I swapped the tire with the spare (new) and set all pressures at 65psi. It will be a while before we put 15,000 km on this one. We'll see what happens. Hopefully the higher pressure will at least reduce this problem.
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