Dave: It is hard to find; it's under trailers. If you buy from the web site, there is no tax or shipping, just a $5 'handling' fee. It came by UPS in two boxes. You can download the PDF file of the manual from the item's page. That gives you a more realistic look as their catalog page has a wood bed on the trailer.
I found it at:
http://www.harborfreight.com/cpi/ctaf/Displayitem.taf?itemnumber=36331
Mark H.
I found it at:
http://www.harborfreight.com/cpi/ctaf/Displayitem.taf?itemnumber=36331
Mark H.