[Tinbasher]

I've trued up rims before. What I do is mount the rim on the rear of the car. Then spin it and fine the low spot or where it's closest to the frame. Then I place a small hydraulic jack between the frame and the low spot and apply a little pressure. You have to go easy hear as you don't want to damage the rear axle bearings and such. See how it reacts. If you need a little more do it again. repeat until the rim is trued up. Not the best way but it works. I plan on making something like Bills Trueness Checker but will a frame work to mount a jack to it. Then I'll be able to straighten the rims more easily.
My thoughts. John Poole The Old Tinbasher.