Actually, see the link below as this is the model of the company's truer that works with the wheel and tire mounted on the vehcile. I have heard this is the better way, rather than off the vehcile.

http://www.tsissg.com/amermac-tire-truers-balancer/405-w-porta-trues


S.A.R. member, Thomas Stone chapter, southern Maryland

If you pick up a starving dog and make him prosperous, he will not bite you. This is the principal difference between a dog and a man.
Mark Twain