Hello to all!! I am new to the site & new to having a Yukon. I recently bought a 2003 Yukon XL with about 90K miles on it. It came with 20" rims & 275/55R20 tires, the tires are General VHP's. Since I bought it the truck likes to wander on rough spots & joints in the roadway, if the road is smooth it rides great. I put it up in the air to check things out & found the idler arm was a little loose, so I replaced it. The truck still wandered, I took it into a local dealership to have it properly inspected & all they could find was an alighnment issue, so I had that done. The dealship said that a big part of the wandering was the oversized rim-tire combo, along with the directional tires that it has. After the alignment it still wanders just not as bad. Is it possible that the tires are the problem? I am open to suggestions & info. We are taking to trip to camp Pendelton to watch my son graduate as a Marine & I want to have a nice smooth trip without having the wandering problem. Any help is grately appreciated, Thank You!!