I hate to even mention this considering the price of lumber today but could you get some rough cut 2 x 12's and make two level ramps in your garage each set of tires?I wish I lived closer to Pymie, but I am halfway between Lake Erie and there, so I guess it's the best of both worlds.
I don't have a cement floor in my garage, it's pretty rough old concrete that the prior owner just dumped and smeared a thin layer when he laid it down. .......... The worst is the driveway where it meets the garage. Gonna have to mull over what to do about that.