Does anyone know of a bracket that can be mounted to the rear of a horse trailer to carry a cart? (A basic, horse-sized single easy-entry cart). I have done multiple seaches on the internet and found nothing. I know I have seen them but I am not sure where else to look. Thank you!

I've seen carts in the hay rack. There is a large stair case for the hay rack that is attached to the rear doors. So I imagine if the door has adiquate hinges, that a rack to hold a cart could be fabricated. But if it sticks out 4 ft. past the door, some kind of lights would need to be added.