18s are alot less common. We do alot more 17 and 20in stuff. But you should pick up some mpg with the littles on itThanks, but apparently no one in the nation can get 37" tires that quick. Fastest I could get them was the end of this week and I couldn't be w/o transportation that long. I did get a set put on there for now. 35" Lion Sport M/Ts. My poor truck looks like it skipped leg day w/ those tiny tires on there.