First thing to acknowledge, there is no vehicle called the Wheeldozer. They mean the Dumper Truck. With that said, there is a dumper spawn at the MBTV location in the Sekreto Wetlands. While looking at the entrance, turn to the right and run down that path to the dumper truck. From there, just drive around until you come across an enemy and press
while the front is down to lift him up in it. bing bang badaboom.
Skip to 7:09 for Dozing