Yikes that does not look like any fun at all!! Looks like he has the same system to raise and lower the house that I have on mine. That cylinder on the side of the hitch with the holes in is what you slide a jack into and then put a pin through the hole attaches the jack to the tongue. Raise and lower it with a drill. Same thing next to each wheel. Kind of funky but it works and I like mine a lot.
I’m surprised to see another one as I have never seen a set up like that until I bought mine last year. Could have it been made by the same guy? Or maybe there’s more of them out there than I know I just need to get out more!