I don't know about the US Army, but the Aussies are using them.. Check out this Land Rover Perentie:
http://www.csse.monash.edu.au/~lloyd/4/LandRover/Perentie/
Here's a description of its accesories:
Truck, long range patrol, light, FFR, winch, MC2.
This mean looking machine is open and without doors. It carries spare wheels recessed into each side of the bodywork, a machine-gun, and a rear-mounted 250cc motorcycle.
Loa 6020mm, height 2050mm
Approach 42°, departure 33°, ramp-over 150°
Weight 4230kg, laden 4840kg