The top one on the magazine covers is the first one I built in 1983.
The next one below is the one I have been currently building since 2009. It should be ready for initial testing next month.
The SuperTruck is the current prototype being built. The FutureTruck is a possible next-generation version if we get (a lot) of funding. All the air gaps between the tractor and the trailer and the complete perimeter ground effects are dynamic and are shown in their deployed state.
The SuperTruck will have a different boat-tail design than shown here. That one in the CFD screen-shot is 3 years old. Also, the SuperTruck prototype has full skirts on the tractor, unlike the old SolidWorks model shown above.