I have this Bosch drill that would solve your ground problem.  It can drill a 1" hole right into rock in minutes.  Although with the lack of rain we have had, I almost need it here to put my run up stand in the ground.  I made one from 3/4 " copper pipe, 2 90* l and one T fitting. Caps on the top, and 3/4 pipe insulation for the cushion.  When the ground is not so hard, I just step it right in, and stick the tail of the plane in it and ready to do what I want. <div>
</div><div> For an engine test stand though, I have some 1/2" steel flat stock, and a 3/16" plate with slots cut in it. I have the 1/2" blocks bolted to the plate with carriage bolts so they adjust, and a pin on each block for the mounting hole in the motor, then a clamp that bolts the motor down.  I need to find out where I put it, havent used it in years.  It has a cable with a clevice on the end and a knob on the other, and it is secured to the plate, and a place to mount the tank with a strap to hold it down. The whole thing clamps to a workmate.  </div>