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Yes you can and it won't be a problem at all. My old truck had 285's mounted on 7" wheels perfectly, then I switched to 10" wheels with the same tire and they still fit! I wouldn't recommend that wide of a wheel with it though. But yes, 285's will go perfect on that wheel.
Ran 35x12.50 on my 04 also without a problem. My problem was that I couldn't keep the mud from behind the rim of them. Always threw off the balancing. Finally got some teflons. Does anyone want some stock rims???