this is a project i will most probably never Finnish as i started something else instead.
its the 4x4 thing and a custom made crane trailer for it,
the 4x4 thing has 4 wheel steering at low speeds, locked diffs and a steering wheel.
the crane trailer has ropes and a invisible leg, the commands for it are are:
F9-F10 lower and lift the crane boom.
F11-F12 lower lift the invisible foot.
'O' connect load
'L' lock crane trailer to vehicle.
to connect the trailer drive the 4x4thing so the trailers hitch node is above the grease mark on the 4x4 thing and it 'L'
to pick up a load back the crane trailer over it lower it so its with in 1.5m from the object and it 'O' once it connects
and the ropes shorten hit F10 to lift the load of the ground and drive away. reverse order for dropping a load.
the crane trailer is usable on other 5th wheel hitches.