Tyco US-1 Box trailer

There is a flat walled and a ridged walled trailer box. You only need to print one of the boxes.

It will work with the trailer depot.
For the coupler:
https://www.thingiverse.com/thing:6839199
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=

The pivot on the truck is long. The spacer on the trailer was originally taller. I saw no reason to shorten it.
The holes will need some finishing. I lubricated the pivot point. The coupler hole is tight.
With my prints, the box fits snugly on the chassis. Results may vary, you can glue it o, if you want.
I have printed it in FDM and Resin, and it works with each. I prefer to print the truck and chassis in resin and the box with FDM.
The doors do not open.