Originally Posted by OldCoot
Don't know if it's an old wife's tale, but I've been told to not reverse the direction of rotation on radial tires, so, IF that is true, you would just move the ones on each side to a different position on the same side.
There was a time in the early years of radials that cross rotation was not used. At that time there was a belief that the steel belts would get oriented to the direction they were turning and reversing that could loosen the belts or cause other stresses. As time went by this was shown not to be the case and manufacturers went back to recommending cross rotation.
As far as car, trucks or trailers I don't see any difference in the rotation criteria. A tire is a tire when it comes to that. Whether rotating trailers tires is needed is a different issue.