Does anyone else have a problem with the tires on their UPS car? I drive a freightliner diesel, automatic, power steering. Love the automatic and powersteering. The truck shakes so bad between 48, and 60 MPH, I can't see out of the mirrors, or back up monitor. The mechanic has tried several things to fix the problem. He had it sent to a larger center to replace one of the drive shafts, but still no good. Front tires, back tires etc, still shakes. He replaced one front tire that kept loosing air, that helped a little, but it started back in with the shakes. When the mechanic replaces the rear tires, the truck is scarey dangerous, until they get grooved back in (about two weeks). I really have my hands full on the back curvey roads for a while. The truck rattles, shakes, leaks water, wipers don't turn off sometimes, fuel gauge goes from full, to empty, and anywhere between, and the fuel light and beeper constantly are going on and off, drivers door has a really annoying clicking noise that will only stop if I jam a stick in it to wedge it open. The mechanic "can't figure it out" With only 87000 miles on it, what a piece of junk! I stopped writing it up, because I am afraid they will replace it with one of the old 500's. I think UPS can do better.