Many big rigs can also be called 18-wheelers. These long transport machines need eighteen big wheels to support a tractor front and trailer back. This title revs young readers up as it unloads information about the parts and purpose of big rigs.
Many big rigs can also be called 18-wheelers. These long transport machines need eighteen big wheels to support a tractor front and trailer back. This title revs young readers up as it unloads information about the parts and purpose of big rigs.