I´m not pretty sure about the terms of the warranty because my brother who is in Texas bought the H1 and also the warranty (by the way, I live in Mexico and here is no Hummer dealers that´s why I asked my brother to buy it himself. I just went to the U.S. and then I drove it all the way down to my town)
Like I said before, I´m not pretty sure about the terms, but you can try here where my brother bought it
http://www.classichummer.com/
wish you the best!
Cesar Guzman