I was able to find another two piece truck and trailer casting on the innerwebz to go along with these 6 castings that @pjedsel has in his collection. In general, they only give a generic name for each vehicle as to their purpose or shape. Maybe one of our military or transport experts can identify the real name, model and specs for us later on. One listing attributes them to be Nib Box and anoher to be Nouveau product.
Troup Transport Truck
Rocket Launcher Truck
COE Tractor Truck & Flat Bed Trailer