i'd go get a 4 wheel alignment first, and if any of the subframe bushings or differential bushings are worn, they can inspect them and let you know.

if it's driving "sideways", look at all the rear arms going from the spindle (where the wheel mounts) to the subframe and make sure they aren't bent.

i know jake has a hicas, do you? if you have a hicas, the rear steering might be messed up, perhaps the tie rods are bent or the rack is locked up or something.