Hey all. I got a question I hope someone can answer or point me in the right direction. I have a 94 K1500 and I will be getting the Whiplash 10" kit. Can I fit 39.5"x15 tires underneath that? Or do you think I should a 1 or 2" body lift? Also, since these are 15 inch wide tires, what backspacing should I use? Thanks for the help!