well one thing you can do is from the rear of your car, step back a few feet and see if you can see the back tires kinda like go in.

The top part of the tire will seem like its going into the car and the bottom of the tire will stick out.

Sort of like when you lower your car alot and you can see that it needs a camber adjustment.
Also look for tire wear on the inside part.
The tires will ride more on the inner side then fully flat.

I bought new tires in March and already it looks like I need to get new rear tires.
even though the fronts are still fully threaded.
I have a pic of what the tire looks like gimmie one sec....