i have a 2001 Ranger 4x4. i want to get some new tires and wheels specifically the crager soft 8 series from summit racing and 33 12.50 r15 mud tires. my truck currently is running stock 16 inch ranger wheels and 265 75 16s and a three inch body lift and cranked t bars. my main question is what backspacing on the new wheels do i need and is going from a 16 inch rim to a 15 gonna cause any other problems? im looking forward to getting them so just need these answered before i buy the wrong thing