I have had this rust on the tires problem since my coach was new. It comes from the cap moving constantly while in motion, it rubs against the steel rim. The movement is very minor but enough to rub the metal, which then rust from moisture of any kind. I fixed mine permanently by getting some small diameter plastic hose, slitting it down the middle. Then inserting over the outside edge of the cap. This insulates the cap from touching the metal rim. Does not affect balance at all, and is un-noticable because the hose is clear. I have not had any rust since I did the above. Cap must be removed to insert the hose on to the outside rim. Then retighten the cap. I use four 2 inch pieces to each cap. Works for me.
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