Incorrect.
The H2 is built under contract by AM General at a specially constructed plant in Mishawaka, Indiana, USA. Although it shares GM's GMT820 truck platform with the Chevrolet Tahoe and GMC Yukon, those vehicles differ in many ways and are constructed in three other GM plants. The H2's final frame assembly is made up of 3 sections: The front uses a modified GM 2500-Series utility frame, the mid-section is all new and is completely boxed, and the rear section uses a modified GM 1500-Series frame which is upgraded for the 8,600 pound (3629 kg) gross vehicle weight
“The H2’s and H3’s are standard chevy undercarriages”
Incorrect.
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He is correct ,, the H2 is a Suburban and the H3 is that Colorado thing ... The Hummer versions have a little less front and rear overhang but other than that everything else about their capabilities is pure Chevy .. Actually the Hummer variants with the ultrawide bodywork are damn near unusable offroad and their extra weight kills fuel economy and performance and lead to disastrous front-end failures in the Suburban/H2 models...
The only real Hummer is a H1 and even that pales in comparison to a lighter weight bare bones “real” Hummer from AM General.
If you want a real off-roader get a Rover or a Land Bruiser... leave the pretenders back at the Hummer dealership.