Or was the platform used for another GM line of trucks?

 

someone posted pix of frames/ differences/ no 2 alike as I remember.

 

Canyon/Colorado vs H3 Frame:

1. Bumpers are mounted directly to the frame rails
2. Additional crossmembers for increased lateral structure
3. Body mounts relocated for increased rigidity
4. Heavy duty jounce bumpers
5. Moved spring hangers for increased ground clearance in off-roading

From 2005 post at GM-Trucks.com | News - Resources - Forums | For The Chevrolet, GMC, and General Motors Truck/SUV/Crossover Owner & Enthusiast

The post is probably unavailable now...

 

Sounds like a lot of modifications to the frame. Certainly a unique body. Is the drivetrain (engine, tranny rears) pretty much the same as the Canyon?

 

GM has gotten a lot of life out of the 4L60E/4L65E transmission, nothing changed there. The I5 is mostly the same; intake/exhaust, cams might be different among the pther models. The axles are standard GM. I think only 15% of the parts are the same with the Canyon.

 

 

Those frame are similar but significantly different.

Pretty much a unique vehicle overall.