I work at Goodyear and we have no problem adjusting all of those, and we even adjust them to the customers needs. Not too long ago we had a Miata in and the customer brought his own sheet with the specs he wanted and we did it.... With places like Goodyear, Firestone, etc. It's really up to the person you are talking to and not the shop. It's still worth a shot to try to get it done at one of those places. Goodyear has a 12k mile/12 month warranty, and I believe Firestone has that aswell, along with a lifetime warranty alignment for like $150.

But yeah, you are right about the lowered cars thing. I've heard the guys up front tell people no that had lowered cars. We don't get too many lowered cars in, but the ones we have had in drove on the rack without any problem.