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I am looking into a new set of tires for my recently acquired '93 Micro-Mini Winnebago (One-ton chassis, 3-L V6, 14" 6-7.25 dually wheels). I only found 2 offerings in full compliance with all specifications regarding load and internal pressure. One, made in China and sold in US as "American Omni" Thunderer R101 offered by Les Schwab (local northwest tire outfit - good reputation) and a second, Yokohama Y356, available (probably from several sources but) from tirerack.com. I am leery of buying chinese-manufactured tires, and the Yokohama's do not get great user ratings, apparently wearing very quickly. Obviously, there's not a big market for these tires in the US. So . . . I am just beginning to research replacing the wheels/tires with 15" wheels and a properly spec'd tire with the correct diameter (~25" overall dia.), if the combination is feasible, hoping to make a wider variety of tires, with higher load ratings, usable over the long term. Has anyone attempted this or accomplished it to their own satisfaction? If so, please share the details. Or is this just a really bad idea?