I want to get my dad a set of wheels and tires for his F 250 heavy duty powerstoke desiel truck. Its a 97 and came equiped with 16's. Was wondering of I could get him a set of 15's, 33x12.5x15 to fit on his truck because it would be cheaper than 16's. If i have to get 16's what size would be good. There is no lift and its a 4x4. Want something a little beefier than stock. Im thinking ill get a set of Micky Thomson's classic II in 15x8 with 33's mounted. Will this work? What backspacing do I need? Thanks Guys. Stinson