I think that the 20's need to be 275/60/20 to look right. The 55's are too thin and your truck needs to sit lower to make them look right. With that being said, the Nitto set up works too. When I was changing set up I couldn't decide between 18 and 20....decided on the 20. I like the 18 but didn't want the harsh ride that came with an "E" tire.