This was another thing found on Thingiverse. Toy Dump Truck by Barspin. http://www.thingiverse.com/thing:537153
It came together really well. I did slightly damage the PEI surface trying to pry the wheels from the print bed. I adjusted the Z lift and that resulted in a bit of lift from the bed on the back of cab as the ABS contracted resulting in the seem on the rear of the front fenders and cab.
Every day I am more and more impressed with the MK2.