This is from the horses mouth instead of the other end. I was the project manager for the build of the H2 SUT race truck. This truck as well as the H3 and H3A race truck were all built at the GM Desert Proving Ground by one engineer and 4-6 technicians. In all cases the trucks are bone stock with the exception of spring rates, shocks and safety equipment. The H2 SUT runs in the SCORE Stock Full class (86X) and in the Stock Pickup BITD class (8111). The H3 runs SCORE Stock Mini (760) and Stock Mini SUV in BITD (3111). The H3A because of the V8 runs SCORE Stock Full against the H2 and in BITD it is in the Stock Fullsize SUV class (4111).
As per the rules, no suspension components are modified in any way. The engines in all three vehicles are completely production with air induction moved inside the cab for obvious reasons. Wiring harnesses were modified to remove unused circuits such as power door, window, radio, mirrors, etc.
The trucks do not just show up at the races for the Hall's to jump in and go. They have all been very involved in testing and development on each of the trucks. Hours and days in the desert between races.
Due to it's stellar fuel economy the H2 SUT runs a 70 gallon fuel cell.
Check out the latest article for the upcoming Baja 500... it has some pictures as well.
http://www.pickuptrucks.com/html/sto...-baja-500.html