Got a 4/6" Cognito kit on the way.

Looking to set it at 6" to run 35's.

Toyo has 2 offerings: 285/75/18 OR 325/65/18

Ill be running them on 18X9 Rockstars (5"BS).

I've never run anything bigger than a 33 so Im not sure if the 285/75 will look too skinny?

go with the 325 it looks much better imo

Don't put 285's on it, my 285's looked retarded when I put a little 2" lift on it for about the 2 days before I put my 325's on it. They looked way too skinny and did not look good on the truck.

They looked way too skinny and did not look good on the truck.

Both tires are 35", there is only 1.5" difference in the width.

Is it that noticable?

It might only be 1.5" which doesn't sound like much, but I noticed a big difference between my old 285/75 16's and my new 325/60 18's in width and they are both only about 33" tall but if you went with a 35" tall tire I think it would be even more noticable.