Check NBC's Today Show video coverage (below) of the Obamas cruising in the new GM-supplied Presidential Limo to St. John's church this morning. We knew this new heavy-duty truck based Limo was quite a beast of burden, but the GM Media pic above doesn't reveal the massive scale of this thing. At the end of the clip, Obama and wife exit the limo, and the roofline is nearly as high as Obama's roughly 6'1" frame. He looks positively lilliputian standing in the gaping doorframe.
Commentary by Today Show reporters reveals that this new limo actually has its own air supply, protecting those inside from potential chemical/gas/biohazard attacks on the Commander-In-Chief.
And maybe my diesel-fanaticism is causing auditory hallucinations, but I'm certain the unmistakable clatter of a compression ignition fires up 21 seconds into the clip with attendant turbo whine on acceleration at 25 seconds. Is that a support Suburban with a Duramax, or the Presidential limo itself being propelled by an oil burner?