My 09 F-150 is about due for a new set of tires. I have a leveling kit on it and currently run 285/65R18 BFG All Terrains. Looking to go a little bigger. How big can you go on a leveled F-150 without rubbing?

 

I'd go with a narrow 34" tire.

 

How do your 285s look and fit? I'm considering upgrading from stock size to 285/70r17 next time.

 

With a 2" lift via BossCoilovers, I'm running 315/70/17 KO2s. That's with +33 offset wheels. Stock chrome clad 18's are +44. Do you plan on stock offsets?
BTW, that +33 are stock Raptor wheels.
I've got zero rubbing with no trimming.

Photos in "My albums"

 

I'd be keeping stock wheels. Trying to decide if its worth losing the ability to park in the ramp at work or not (truck JUST clears the max height markers right now).

 

I plan on keeping the stock wheels.

 

Sounds like you may be screwed if you went to taller tires.

Good looking truck! A little taller tire would look good. Do you know the offset of those stock wheels? I'm thinking they're likely +43.
When I got my present tires, the dealer made sure there would be no rubbing before they would install them. I knew they'd work, but still thought it good they checked.
It seems I recall some guys using 295/70 on the 7 spoke chromeclad. That size would look great on your truck.
Check what clearances you have now, and consider the size difference, tire for tire, and go from there.
I'd have to do the same, but asking here was a good move.

I think quite a few guys run into trouble when they run different than stock offsets. I was very careful when I made my choice of tire/wheel, trimming and or modifying body parts is not what I wanted to do either.
This is just my opinion, and not shared by most, but if you have to do trimming or anything, the combination you chose doesn't fit. But many many guys do it.