With the right wheel, a 37/13.50 can go under a leveled truck with no rubbing. 3" in the front with 3" or bigger rear blocks, and you can easily clear 35's and 37's. Nothing taller though, and nothing wider than a 13.50
I have been looking at the airbagit kit as well. They have been pretty helpful, but I wanted to make sure I talked to someone who has tried it on their truck, do you know of anyone who actually has used that kit.
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