They are at 45 psi now which is about what I usually use - has been higher at times. My tire dealer says the undriven tires are prone to cupping (in the "bad ol' days" it was the fronts!). I'm convinced that frequent rotations are essential to hold down the noise and wonder if Ford's 10k recommendation is often enough. Proper alignment can sure prevent other wear problems but may not prevent cupping.
My rear camber is LR = -1.4* and RR = -2.0*. Spec. is between -0.9* and -2.4*. IMO, the high negative camber caused my cupping and noise. I suppose Ford is balancing cornering performance with tire wear and has chosen a high rear negative camber spec. I do believe that reducing the negative camber to -0.9* (minimum spec) with the equipment you linked to would have reduced my cupping and extended my "tire life" (noise related) perhaps by 20%. The camber specs for the front are about 1* less negative than the rear.
I believe that tire rotation (without reversing the tire on the rim) will likely not prevent cupping. It's just not economical for me to pay to have the tires reversed at say $15 / $20 a tire every 10 k miles or less. I also don't feel like rotating tire every few thousand miles myself to see if more frequent rotation would help. I replaced my OE tires at 48 k miles at Costco and took the car in at about 7.8 k miles on the new tires for rotation. I went back to Costco after another 5.5 k miles and the tire tech said there wasn't enough miles on to rotate again. The tech said 10 k is Ford's schedule (as we know). I've got around 18 k miles with no cupping / noise issues yet on the new tires.
Also, just to be clear my tire cupping was actually very minor at 48 k miles but the noise was unbearable especially at very high speeds. If I were just going to drive around town and at moderate speeds, I likely would have lived with the noise.
Edited by Plus 3 Golfer, 03 April 2016 - 07:05 AM.