I would get the 15x10's then later down the road if you get more lift and you want to go to a wider tire you can without pushing the limits of the 15x8's.

 

I thought about this but I decided that if I come to that point a few years down the road I will prolly just get new 15x10's. I figure if I have the money for a suspension lift by then I will have the money for a new set of wheels.

 

I think you are a little confused. The backspacing on a stock ranger is 4.5" not 3 5/8". The lower the number the further the wheels are going to stick out from the inside of the truck. in all the post's I have read about backspacing I have not seen anyone once say with 3.75 bs and 33x12.5 on a 15x8 rim that they had rubbing at full turn. I have seen many many people say that the above mentioned setup would keep you from rubbing. I am confident that my 3.75 will keep me from rubbing.

I looked up some info for you so you can do a little more reading on the subject. https://www.ranger-forums.com/forum2...ck+backspacing