E-frame and dolly system for stocking production lines

A method of stocking a production line using a motorized truck having a towing adapter and a plurality of trailers having wheels that are provided with a towing hook and a hook receiver respectively on one of a front end or a back end, each trailer having two sides extending between the front and back ends, the trailers being accessible from at least one of the two sides to load a plurality of platforms having wheels onto the trailers for transporting a plurality of wheeled platforms on the trailers, the method comprising:

• loading a first set of wheeled platforms loaded with a plurality of parts onto the trailers from the side;
• actuating a locking mechanism by engaging at least one wheeled platform against a U-shaped member rotataby disposed on the frame, the locking mechanism being adapted to prevent transverse movement of the wheeled platform relative to the frame;
• transporting the trailers with the first set of wheeled platforms and parts carried thereby to the production line;
• unloading the first set of wheeled platforms one at a time from the side of the trailers;
• and
• loading a second set of empty wheeled platforms onto the side of the trailers one at a time to replace the first set of wheeled platforms.