Overview: In this installment of Mega Truck Alphabet, we'll learn our ABCs and the letter "d" as we take a trip to the desert in a big dump truck. This video for preschool children will focus on the capital and lower-case letter "d" using the words desert, dump truck, dog, dune, dinosaur, doll, and the name Daisy. Be on the look-out for some surprise items that start with "d" too.