okay so I have a 2003 f150 about to get a 5 inch Rough Country lift and I want the wide look so need some help. I wanted to get 12 wides but the lift says you only can do 4.5 backspacing max which is only a 10 wide rim..... thinking about maybe getting 35x13.5 tires but not sure might just do 12.5 tires not sure I need some help and if you have pictures post please

 

I'm on the Rough country 5" with 17x9 XD series spies on 35x12.5R17 tires and the tire currently sits right at the edge of my fender.

 

The backspacing is in no way limited by the width of the wheel, so your "4.5 backspacing is only a 10" wide wheel" is incorrect

 

Here's some reading for you

https://www.rsracing.com/TechWheel.aspx