Tyco US-1 Trailer Train

This is to make a Road Train. It has a loop to go on front trailer's rear pin. It has a guide pin built in. It is made so it will lean back and the loop will slide up the front trailers pin, when a trailer is on it to keep it from dragging.

For the wheels:
https://www.thingiverse.com/thing:6931486

I used a 27.5mm long by 1.2mm diameter axle:
https://www.slotcarcentral.com/mm5/merchant.mvc?Screen=PROD&Store_Code=SCC&Product_Code=8AAGGTUPUSGAROE&Category_Code=

I have only printed in resin, but should be fine in FDM.
It does not work with the trailer depot, but I have a reworked one that will. I will upload it once I print and test.