Wheel sizes possible on 1-ton with big brakes?

[05oneton]

I am at it again with another question....I guess I should have bought a Ford years ago.

Anyway, I want to know what size wheels will fit on my 05 1-ton. It has stock 18s and it doesn't look like there is much clearance between the wheels and the brakes. The guy at the tire shop said he didn't know what would fit with the newer bigger brakes, so I definitely have to bring this question to the pros--all of you.

 

[Fine69]

17" wheels are the smallest wheels that will fit.

 

[Buffs F-350]

I would stick with the 18's or maybe go up to 20's.