Only bent front suspention would give you a truth pull. If the rear was the issue, then it would wobble or dog track but even dog tracking you can maintain a straight heading. This is besides the tires them selves.
Really the front creates the thrust angle, and the rear wheel tracks that. Ive had my engine mount and subframe come loose, it wasnt much but it sent me into a death wobble dow. The highway twice. Saved it but barely. Having experienced bad stability parts id say check the front end, if it looks straight check your steering head bearings, if good gotta be the tire. If not the tire, then youre the issue.