Not sure about that... even though I changed mine to SPC UCA, I never researched the space between the UCA and tire/wheel.
If it refers to 'caster', I think that's shifting the direction to the bumper or mudflap.
Yes, 285 fit stock rims/wheels. I have 285/70/17 on stock wheels, with a 2.5" lift. But with 285, they will rub the upper control arms unless you push them out with wheel spacers (or a buy new wheels with better offset).
daystar works to correct lean!
I just installed the Daystar spacer on the Rear Driver-Side spring. It corrected the lean - my height measurements are same on both sides now!
My setup is 2007 V6. I installed the Toytec 3" lift. I ended up with about 1/2 inch lower on the rear driver side...
