Daniel - The Suburban with the minigun really does exist. It's called the "Raptor". Armstech/Arcane Technologies, out of Pheonix, manufactures it as a VIP protection vehicle. The minigun is on a 360-degree ring mount with a hatch in the center so the operator can stick his head and shoulders out. The floor of the vehicle is all steel mesh so the empties can fall out. Really well put-together.
One thing, though. No armor. The theory behind the Raptor is that the bodyguards should be out killing the bad guys, not hiding in the limo. Besides, an RPG-7 will punch through any armor you care to slap on a car.
Later,
Chris
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"TV what do I see, tell me who to believe, what's the use of autonomy when a button does it all??" - Incubus, Idiot Box