One way to tell if a tire is out-of-round is to jack it up (safely) and spin the tire. You can see a bad out-of-round situation by just looking, or placing something on the ground and holding it close to the tread. I usually just use a screwdriver. You can identify a crooked wheel that way too.
I even had one Michelin that had a crooked tread on it, which causes a really strange wobbling/vibration situation. (Michelin did give me a new tire for that one). Bottom line is sometimes you have to find the problem yourself because not all of the "professionals" can identify the problem, or simply won't. It's much easier to blame the situation on your equipment!
Ken & Jeannie
96 Vectra Grand Tour 35' DP
Jacey (terri-poo, waiting at the rainbow bridge), Jack (silky terrier)