Theres a Hummer thread that rivals Thump*140s blitz thread. It spans about 3 years and has a **** load of pages and posts so you'd have to be keen to read through it all. Rodbox would be able to help you out with anything Hummer related http://www.miniriders.com.au/general-chat/13985-going-try-new-hummer-g4-36.html