Thanks for all the ideas. I will try and switch tires and see if it follows. I can do that myself and not have to take it anywhere.
No ballast, no uneven weight. Tires are running at same pressure. Only difference I can think of on right to left balance would be the spare tire in the front on the right side.
The bouncing is mainly in reaction to bumps. It tracks fine, but when you hit a bump, the right side seems to bounce more. Kind of makes me think springs?
I will check the bearings too. Just looking for looseness in the bearings? Loose gland nut? Feel for wobble in the brearing or grinding?
1996 Prostar 205 LT-1