Having both skids and supporting legs as an assembly which attached to a central ball joint under the helicopter would achieve much the same thing. It could be unlocked for descent on a sloping surface and locked by the weight of the helicopter settling on it. By limiting the range of angular movement, blade strikes with the ground would be prevented.
A similar approach to that in the video would be to use a system like the Citroen hydropneumatic suspension. This offered damping, self levelling and variable ride height.
Last edited by Mechta; 17th Sep 2015 at 14:15.