I was already toying with the idea of making the rear underrun bar on a hydraulic system so I can lift it out of the way if I need to.
Now i am thinking that i might be able to do both the tow bar and the underrun bar at the same time, its a work in progress.
the plan is to make a hinge using a 24mm bolt as a pin, this will bolt on the rear of the chassis, the drop plate is a bit of 6" C channel, i will attach a ram to the back of the channel to lift it all up out of the way.
This is as far as I have got:
