There was much controversy over this in the Transformers fan community because optimus-prime is almost always portrayed in the various cartoon series as a flat-nose cabover semi-trailer truck (or later as a fire engine); his movie incarnation would be the second with an extended nose conventional cab (following his role in 2002-03's Transformers: Armada). The filmmakers have said that, ignoring the fan-termed "mass shifting" associated with the series, Optimus's final official height of 28ft (almost 10m) in robot mode would not have been possible to allow for all of the mechanics of the CGI model if they had gone with a cab-over, which would have dropped him instead to a smaller 20ft (almost 7m). [Wikipedia]

  

TRUCK CRAFTS FOR KIDS: Ideas to make trucks with easy arts and crafts decorations, instructions, patterns, and activities for children, preschoolers, and teens

Just like boats, children (especially boys) are fascinated with trucks. Some will never grow out of that stage. Because of this trucks will forever be a popular theme in children books. Fire trucks and dump trucks are the most popular types when it comes to crafts. Both these trucks can be made from boxes or Styrofoam egg cartons.

Trucks can also be made from empty milk cartons and using water bottle or soda bottle caps for the wheels and straws or bamboo skewers for the wheel axles. You can also make a truck collage with your toddlers using different color construction paper or card stock.