Its really getting hard to pin down the Hummer builds now adays because of model updates. The H2 actually has three frame sections built into it. It starts out as a Tahoe/Yukon, has a custom built midsection and and truck 1500 frame end section. You can pick a section out and I guess claim it is based on that truck, but.
The H3 starts out close to a Colorada/Canyon truck frame with added sections.
2010 gets you new frames, oh joy!
The H3 is the only Hummer GM builds