GM spec for torquing the lug nuts is as I stated above. This comes directly from the GM service manual for the H3.
Now, I haven't checked, but I would assume they use lug nuts, not lug bolts. I might be wrong, but the last time GM used lug bolts it was a disaster.
This torque of 140 N.m matches the torque on every GM vehicle I have ever worked on; other than trucks which requires 190 N·m (140 lb ft) - six and eight stud patterns. So, I would go with the 140 N.m, but it is your vehicle. torque to whatever you desire.
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Black Sheep Hummer Squadron
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