I also have a 2010 Mini! Mine is the 18L with the sofa, not dinette. I've had mine since 2011 and have never noticed uneven tire wear between left/right, but we don't put a lot of miles on it either.
Is your calculated weight offset including items loaded on the right side? Like is your fridge loaded, drawers full of clothes/dishes, exterior storage full?
I've never tried towing it with only the tanks full and nothing else in the trailer, but when it's all loaded it tracks very well with no visible leaning to the left.
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