Evan is fascinated with trucks. I asked him today what his favorite truck was. He told me his favorite is a tractor. Although it probably doesn't fall into the "truck" category, you will often find all of his tractors at the "construction site" right along side his other trucks.
Some of his other favorites...
"Giant Excavator" - "He makes big piles of concrete."
"Bulldozer" - "He scoops and crawls at a creep and makes piles"
"Roller" - "It turns, turns, turns"
"Garbage Truck" - "It dumps the dirt and the garbage. The dirt is inside the garbage."