I designed this trailer to carry 18 site fences, with 18 foot plates and a lot of traffic cones.
It fits to the Bruder coupling.
I used the these tires: https://www.printables.com/de/model/98538-tire and these hubs: https://www.printables.com/de/model/98546-hub/comments
For the bruder adapter I used two components from here: https://www.thingiverse.com/thing:3305512
Print all parts, I used black PLA for all parts except for the tires.
Put the tires in the hubs, then plug the axis through the holes in the chassis, add the axis distance and glue the hub with assembled tire in place.
Also glue the holders on the top of the chassis, there are fitting holes.
Use the M3 Screws and Lock Nuts to assable the trailer adapter to the chassis.
The author marked this model as their own original creation.