I have a question for you guys, I have a 22' suburban RST duramax. It comes with the 22" wheels that I have never cared for but figured I'd run them until I figured out what I wanted to do. I tow about 5k trailer weekly and drive in gravel often. I was thinking of going with a 18" rim , or maybe a 20" since the wheel wells are pretty big, would going with a smaller wheel with larger tires be heavier than the little 22" tires? I like my mpg, I just want some more rubber for towing and the gravel that I drive in everyday. I'd like to get some AT's just not sure what size I should go with 18" or 20" for my situation. And also, what will the ride feel like between the stock 22" and a 18" wheel with all terrain tires?