If the top of the tire tilts outward from the body, camber is said to be positive.
Going too far in this direction will cause a pull to that side because the tire itself forms the shape of a cone. You can get a pretty good idea of camber by using a carpenter's level, although you'll need to be parked on a perfectly level space.
With solid rear axles, the repair will require replacing the rear links or straightening the frame.
WANDERLUST If your car doesn't have a definite pull to one side, but instead a sloppy, undisciplined tendency to wander all over the place, the first thing to think about is wear in the steering and suspension.
On IRS cars, tapered shims are typically installed under the rear stub axles to reconcile the thrust line and centerline and to restore harmony.
GEOMETRICAL CONSIDERATIONS Camber refers to the tilt of the tire from the vertical, and this has a profound effect on directional tendencies.
Zero camber means the centerline of the tire is perfectly perpendicular to a level surface.
You're almost enjoying a long drive on a nice, flat interstate.
Almost, because it's windy and you need to saw the steering wheel back and forth, tacking like a sailboat, to stay in your lane.