Minitruckin "Interest Groups"?

I have a school report to do on an "interest group" of my choice, for example MADD mothers against drunk driving, ect.. but i want mine to be on something im interested in, so if someone could let me know of some groups that might relate to anything having to do with minitrucks, custom trucks, ect.. let me know. i have to have info on rules, dues, income, purpose, membership, community involvement, history..ect. So hopefully someone knows of one, and an easy way to get all of this information, thatd be cool as hell!