Glenn,
Thanks for the explanation. I understand the slight difference in the tires' profiles and that it is not significant for mounting purposes. Are the trailer tires more expensive? Otherwise, why move the truck tires? I can think of a couple of reasons, but don't know if they're correct.
1) Truck tires are cheaper for the same product.
2) You prefer to have the newer tires on the truck; more tread on the truck tires and less opportunity for the elements to degrade the trailer tires before they need replacing.
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