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I wonder if the problem with the aluminum wheels is torque. If I'm not mistaken, the 8-bolt pattern wheels are "lug-centric" versus "hub-centric" meaning the wheels are centered on the 5/8" lug studs in lieu of the hub center. If the lug nuts get loose, then the wheel has a tendency to "rock" back and forth on the lugs and start fractures. I re-torque our lug nuts every other trip or sooner if we travel really bumpy roads. Aluminum is "soft" and the nuts seem to loosen fairly easily. I don't think Keystone would put under-rated wheels on their units. Just too much liability involved here. I'm not sure, but like on most steel rims a DOT number is stamped into them. Cross this number over to the DOT specs and you can find the ratings of the rims. I'll take off one of our rims this weekend and see if there is any info stamped on the aluminum rims & re-post what I find.
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