Trailer for barspin's Toy Dump Truck

This is a trailer made to hook up to the toy dump truck here: https://www.thingiverse.com/thing:537153

It's a modified off of his chassis, and requires the axle and wheels present in his model.

My boys love his dump truck, and have been asking for a trailer for a while.

UPDATE: Strengthened hitch post. Added other small details.