Okay seriously wanting to try 35's with just a daystar, Powerage has them

https://www.f150online.com/galleries....cfm?gnum=5005

From what I can tell his wheels are
+2mm 5 back spacing

wheels I want are +14mm 4 1/2 Back spacing

Is that worse or better for not scrubbing?

 

It's worse. Less backspacing pushes the tires outward. However, you didn't say what width the wheels are. You may fit 35x12.50's if you can find an 8 inch wide wheel with 5 1/2 inches of backspacing.

 

What kind of wheels did your truck come with?? Im pretty sure if you have the stock FX4 wheels, you could run 35's with no problems.

 

I am wanting 18x9 Motto 951's

yeah, probably scrub

 

That would for sure make it worse. If you went with a 10 wide tire then maybe. As long as you had like a 71/2-8" wheel. Or just do 33's if you want those rims.