Have you tried to put one or the fold up in the ground ?
The winchbitch has to guide it into the ground the harder you pull the deeper it goes. So unless you have wireless remote control it's a 2 person item.
Try to find a winch challenge event it good to watch a motor with 3 winches dragging its self round.
Funny, I've been thinking about looking for a comp to go spectating at, last one I went to was in Germany and it was a hoot.