Stegarbasaurs are bulky quadrupedal Dinotrux that actually move around on six wheels, but if a special and rare bolt is removed from their transmission, then their movement will be reduced to zero. They have large jaws with a slight underbite and a rough conveyor belt on the inside for consuming rocks, and beyond this is a series of multiple stomachs with more conveyor belts and other mechanisms for moving rocks to be digested. Along their backs are spikes that can be aimed and launched at targets, usually as a form of defense, and they have tails with four points on it for grabbing rocks and other objects; below this tail is a hatch for releasing waste products from any meals.
Most Stegarbasaurs live in herds and eat many different kinds of rocks, making cube-shaped bricks or releasing a cloud of noxious green gas fumes, normally after eating. However, their delicacies for rocks lead them to accidentally eat Tools, among other things, and according to Garby they cannot digest ore well, even being unable to eat from magnetic ore deposits. Like many Trux, they are afraid of others like T-Trux and Scraptors, but will still stand up to them.