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One other thing to consider with the 20's vs 18's is the 20 will weigh more. Thus, a little more torque to turn and a little more brake to stop. Maybe not enough to notice, but still a difference.
That is true.... I am planning for the future too though. I may take the truck up a couple more inches some day and go for the 37s, in that case, the bigger wheel starts looking better and better.