Looks like a good idea to me. I saw something similar from a Pinsider in England so I knew exactly what they were. His were solid metal handle bar looking things which bolted to where the legs attach.
I don't use a hand truck and getting the pins in and out of my pickup is hard on the fingers and back. Once it is out of the truck and on the sawhorses to attach the legs I am not sure if it is any better than not using them but that would be personal preference. But I do see the utility in them.