I agree and disagree with the affording a $35k truck thing. Not that it is the case with First Hummer but I am sure there a plenty of people that will be getting the H3 by stretching their budgets so the extra tire may not be an immediate option for then. Now if you are stretching your budget that much then you probably shouldn't be doing the mods anyway
Now if you rotate all five tires, you are at least using all five that you paid for but wouldn't you then always have one tire that is slightly larger than the rest if only by a little bit?
As far as issues with the Stabilitrack or traction control, I don't think that would be a problem. Like Fox said, there would be a very negligible difference between the too. I am also sure that GM worked in a degree of tolerance between tires otherwise every vehicle with these options would have issue when one of the tires goes a little low the driver doesn't immediately notice and correct it.
As you said HiSpeed, just my 2 cents, take it or leave it
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I don't care about the "Jeep thing"
as long as my mail is on time!!!
Slate Blue H3 Adventure w/sunroof, Monsoon/NAV, DVD and marker lights