I'm sure one could be fabbed up fairly easily. You could get some threaded metal pipe and plenty of bolts to attach it to a trailer hitch, or get the materials and have a metal shop do the final welds for you for a fraction of the price. Add some black paint and there you go.
Just don't drive with it attached.
One place you may want to look is a Tractor Supply store. They have a ton of hitches and accessories to attach to a truck. Perhaps you could find something that would work or make fabricating one easier.
Utility Trailer Parts & Accessories – Trailer Wiring, Lights & Jacks from Tractor Supply Company