ok, I just tried this out on the across and it's simpler and easier than I thought, and works very very well.
ok it's simple add two noes 0.3m +- in the z direction from the hook (, h) node with the same x and 7
then connect those two nodes to all the same nodes the hook node is attached to, then hook them to each other and then to the hook node.
and the nodes to the contactor list and your done! here is the added code needed for the actros.
new nodes, add the end of the node list:
; new 5th wheel
79, 4.80, 0.85, 0.95
80, 4.80, 0.85, 1.55
and nodes 79 and 80 to the contacters list. the Green semi trailer (37tons) is already set up properly, so hook up the actros to and have fun! It's atually much more stable and you won't have trailers tipping on their side when you go around a corner.
79, 80, i