Rotation of tires on a vehicle is normally done to equalize the wear on tires. With radials, the rotation should be from back to front, keeping the rotated tires on the same side, keeping the tire rolling direction the same. On an RV, since there are normally 6 tires, rotation seems unnecessary because you cannot do this without mismatching the rear tires. I would just replace the front tires when needed as well as the rear tires when needed even if this means going to the tire installer twice. You can also sell used tires to avoid the "recycle" charge when there is still some wear, 5-10K miles and probably come out ahead or sell the front tires when the rear tires are 1/2 worn to optimize your steering and safety.
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