I recommend talking to a frw weld shops and seeing what they can do. I just added a receiver to my trailer to haul bicycles. The biggest factors were the trailer's frame size, frame access and the carrying weight.
IIRC, federal regs allow for 15' of length behind the centerline of the rear axle without any special permits, but also remember that that platform will swing way out wide on corners. If you go to any tight campgrounds or off the highway in any cities, then you may run into so issues.