i have an 03 f350 stock suspension currently running 285/75/16 cooper stts and just bought a new set of 20x10 american racing dominator teflon coated black wheels. 0mm offset and 5 1/2 inch backspace. any idea on size i can fit or any pics of sd's with 20's thanks.

 

5.5" backspacing is probably going to rub on the leaf springs pretty good. Generally 4.5" BS is about as much as you want on the 99-04 leaf spring trucks.