Thanks for the compliment. I use 1.5" spacers/adapters with the stock Platinum wheels. I use that width because the wheel studs are 1.5" in length and you get full thread depth on the spacer/adapter and the wheel.
Really like the look of your truck with the 35x12.5's on the Platinum wheels. I am getting ready to install a Rancho 4" and 35x12.5R20 Toyo ATII's on Platinum wheels and saw some posts that 12.5's have clearnace issues with the UCA with stock wheels. Did you need to use wheel spacers? If so, what width?