Paint a stripe of any enamel across the tire with a brush.
Drive five miles after paint has had a chance to dry. No hard corners or stops, please. Now check each tire.
Left front
(left front here is showing wear on outside shoulder, due to smooth tread blocks, this is not too much toe-in, but rather a tad too much positive camber)
Right front
(same is true for the right front here, but this tire is also showing stress on the outside shoulder due to heavy urban braking, there is clapboarding on the outside tread block, almost like ratchet teeth)
Left rear
(notice that it is the inside tread that has scrubbed off the paint, this suggests maybe too much negative camber but considering the extra weight being carried, I'm not too concerned)
Right rear
(this tire is better than the left rear, and my last alignment specs bears it out > the negative camber reading on the right was - 1.4* and the left was - 1.5* . . even this subtle a difference shows up on the paint test)
Timely front-to-rear rotations will easily keep these tires from wearing too strangely, the rears are working down the inside shoulders then will get the outsides down when moved to the front and vice versa.
Remember to check your wear patterns in a safe and legal place,
. . . and remember to enjoy the day.
