Is your 06 Crew Cab a 1500, or a 2500? I run the same size on my 06 2500HD with no probs at all. I have 305/50/R20 Toyo Open Country A/T's on Ultra wheels.
I have a much easier time braking with my truck that my Wife does with the same tires only in 18" on her 1500 Suburban because of the brake size difference.

I have a much easier time braking with my truck that my Wife does with the same tires only in 18" on her 1500 Suburban because of the brake size difference.