Phil,
I bought one of these a couple of years ago as it seemed the best way to be able to level the van and use the Alko wheel clamp that came with it.
As a leveller it is superb - from a practical usability point of view they are rubbish! They come provided with an attachment for winding it with a cordless drill - if there is a cordless drill anywhere that can lift around 750kg using the thread on the leveller I would be amazed! I bought a ratchet spanner and this works okay, but if you are lifting more than a couple of inches it is a real pain.
I think that newer models have a different thread rate on the lift screw, but it will still be hard going - and if they have changed the thread to make it easier to lift it will take even longer!
In all, looks good, is stable, but not too practical.
Neal