maybe a belt has let go in one of the tires

Roadforce balancer is the way to go. They can find the tires heavy spot and turn it to match the heavy spot on the wheel, then balance. Its designed to put pressure/force on the tire/wheel as if its rolling on the ground. Therfore way more accurate than a regular balance machine.

X5SND, Ok. Ill try to source a good shop in the Twin Cities, MN area.

No its not a loose belt, my tires aren't bald.

Anyone in the TC area know of a good road-force shop, I'll search around but maybe one of you guys know where to go?

Thanks

You can go on Hunter's website and find shops which use their roadforce machines