I bought the system and It does work. Just be aware that ground sloping in more than one direction can be problematic. It worked the first time I tried it, and it was surprising easy. The ground sloped both down, and sideways making the system highly unstable. Just be careful.
Any Reese Revolutions folks out there you know of that have one of these mounted on their rig? (6 Actual will give ya a hug if we can mount this...she HATES that level-tango as she calls it )
Here's how I mounted mine on an alum plate screwed to the bottom of the cap.