Would like to know which length of body mount coupler they use on their 6 wheels truck passenger cars ?
1015/1016 depending on the car... for example the diner uses a 1016, the Mail baggage, 12-1, 10-1-2, paired window coach & baggage all use 1015's
the RPO appears to be an exception using a 1023 style coupler.
I don't have any other body styles to confirm what they use...