The following 2 flat cars by majekear are trainz-build 2.5:
FlatCarNorfolkSouthern195005ant,<kuid2:56063:100604:2>
FlatCarATSF93393ant,<kuid2:56063:180608:2>
The config.txt file of each show they are aliased to kuid:-1:100017, however, the config file also has a mesh-table that references a body...