An update to post #4: We purchased the system at the Rally in Goshen, and ended up installing ourselves after all. DH had to purchase a good quality drill since we did not have one, and we borrowed a few other tools, like an impact driver (to loosen the underbelly).
Starting at 8am he was able to install the rear legs before lunch, and by dinner the whole system was operational. He did this on a grass site, hooked to the truck, with no help other than when I assisted him to fish the wiring harness across and along one side of the underbelly.
He still took more time a little later once we returned home to finish the placement of the control box, secure the extra wiring, adapt the external switch to fit our existing hole, and add a weather-proof cover to the switch.
There's a writeup of this in the latest issue of Heartland Highlights, if you are an HOC member you can read it here.
Since I assist with unhooking and setup, I get to use it, and I love it!
Erika