GEnx-2B

Wingsoverprestwick is a bit of a sneaky tag for this one but I think the load on the trailer will allow me to get away with it.  This truck is carrying a GEnx-2B Jet engine which is used in the Boeing 747-8 series of aircraft.
 
The blue steel frame on the low bed truck is the actual transport frame for the engine which when it arrives at its destination is used to move it into position for installation on an aircraft.  If you look closely you can see the wheels that drop down to move it.