See the PDF link below for installing body mount coupler boxes, new trucks and wheel sets on Tyco Hoppers.
https://images34.fotki.net/v1681/filey1JY/a4014/4/4125954/16375553/RetruckingTycoHoppers001.pdf (https://images34.fotki.net/v1681/filey1JY/a4014/4/4125954/16375553/RetruckingTycoHoppers001.pdf)
(https://images12.fotki.net/v1686/fileL3KM/a4014/4/4125954/16375553/tycohoppercoupler.jpg)
Same as the AHM car link, getting a blank page if FireFox and "corrupt file" from Adobe reader if downloaded.
Len