http://jalopnik.com/396044/do-not-drive-a-suburban-near-utahs-dugway-proving-ground This one is easy.... :bsflag: (no emoticon for that...surprisingly)
No probably not. As you can see, most rental Suburbans these days come with complete exterior Halon systems that completely avoid the badging on the side.
neither, I am too lazy too look this up but I'm betting it was the result of some hillbillies trying out their homemade .50 cal.