This is an example of a 19" optional tailgate on a body built by Harbor Truck Bodies in Brea, CA. There are some shots here of it closed and laying down. This particular body happens to have a raised cargo bed enclosure as well as a horizontal series on the curbside. Of course, Harbor is famous for their standard Stainless Steel lids.
Contact Harbor Truck Bodies at 800-433-9452 and visit the website at www.htbi.net.