See the PDF link below for installing body mount coupler boxes, new trucks and wheel sets on Lima Cabooses.
https://images34.fotki.net/v1681/fileiycz/a4014/4/4125954/16375553/RetruckingLimaCabooses001.pdf (https://images34.fotki.net/v1681/fileiycz/a4014/4/4125954/16375553/RetruckingLimaCabooses001.pdf)