Got a 2012 f250, it has air bags in the rear so it raised the back slightly otherwise stock. Can I fit 35s on stock suspension or do I need a leveling kit or a small lift?

 

I had a 2011 f250 6.2 (moved to a 12 psd now) I have run 325/65/18s on both trucks. Those tires are 35" tall and probably about 12" wide. They fit fine but I would get a little rub on the on the passenger side when the wheels were turned all the way to the right.
On the gasser I trimmed the plastic wheel well a little and fixed it on the new 6.7 I installed a 2" leveling kit and it fixed it.
Hope that helps

 

I have these on my truck, and they fit fine with no rubbing at all, even at full lock with the suspension articulated in either direction. I have no lift added, but the front end does have the snow plow prep package, so the springs may make it sit a little bit higher.

 

Those tires are a Load Range D, not E. Also with a Max of 50 psi, doesn't your TPMS go off? You are losing 600lbs per tire of payload allowed. Plus they are only 34.7" too, not really 35's. I was looking at the Duratrac's in 305-70-18 and found out they would rub at full turn so I opted for the stock size as I did not want a lift.

 

Running Toyo Open Country M/T's 35/12/20 with no rubbing on my '11F250 with camper pkg.

 

Correct, they are only D's, they do not offer an E' and I have yet to tow heavy enough to need the extra payload- which is a 220 to 550 pound loss per tire, depending on model. Either way, I am still above the rear GAWR which is 6100 lbs(3195lbs per tire x 2 = 6390 lbs). The TPMS- yep it's been on the whole time, I got used to it. As for the 34.7", the tires actually measured 35 7/8" inches when new, quite a bit more than what they say they are. As long as I keep them properly inflated, and tow within the manufacturers ratings, they will be just fine. I do not know why you heard the 305-70-18's would rub, that is only 34.8" tall, and narrower by almost a half inch than what I am running, so it definitely would not rub
at all. And again, I checked mine at full lock in both directions with the frame articulated on steep bank.