There is. Tractors for semitrailers have a fifth wheel, of course. That's the 90mm size. There's a smaller 50mm size used for RV trailers. The hitch for that bolts into the truck bed.
Yes, but no. The thing is I don't want to give up the bed of my truck in order to hitch. I use the truck as a truck when it isn't attached to the trailer.
So something more in line with the rail car system is in order.
So something more in line with the rail car system is in order.