Trailer and interchangeable modules

A system for transporting one or more items on a public or private roadway comprising:

• a generally rectangular bed having an upper side, a bottom side, and a perimeter;
• a steel band spanning at least a portion of the perimeter of the bed, wherein the steel band overlaps and is mounted to the top side of the bed, and the steel band comprises one or more holes along its length;
• and
• one or more modules configured to be removably mounted to the steel band, wherein the modules are securely fastened to the steel band by inserting one or more fasteners into the holes in the steel band.