It's your truck so do what you will...but I wouldn't go anything bigger 18" on the Rebel. Why buy a truck that is so off road capable just to throw some skinny rubber on it? 20"...especially 22" rimmed tires are expansive with not many options out there. Also, working in a tire shop, I have seen a lot of issues with 22" OEM rims as they get bent so easily and if you live in an area that has crappy roads you'll have to be extra careful not to bend a rim.