We went through this before, but I can't find the post in a Google search. :-)
The number you're quoting is the Gross Vehicle Weight of an Expedition (the middle Ford SUV. Same chassis as the Lincoln Navigator). That's the maximum weight it'll carry.
The Curb Weight (the weight of just the vehicle) is substantially less. Around 4900 - 5400 pounds (depending on options) for a police version according to [link|http://www.fleet.ford.com/products/specialty_vehicles/2002Expedition_special_vehicle.asp|this] Ford page. In contrast, the Excursion's Curb Weight is 6600 - 7600 pounds [link|http://www.fleet.ford.com/products/specialty_vehicles/2002Excursion_special_vehicle.asp|here].
Note that the Excursion is ULEV (an Ultra Low Emissions Vehicle). :-P
If one of your gripes about UAVs is that people use them as commuter cars (they don't carry anything in them), then it doesn't make sense to use the GVW number (the maximum fully-loaded weight) in a rant against them. If you want to use the Curb Weight, then it helps to get the vehicle name right.
In my humble opinion anyway. :-)
Cheers,
Scott.