I had one about 13 years ago, did the job like I needed it to. Electric powered, and required you to hook up to the battery to, setup took a while but it was well worth it. It had it's own mounting system, didn't depend on using the jack. The down side was it conflicted with my Equalizer WDH so I had to take it on and off.
But trying to back up with the gas line that was misplaced nearly caused a divorce, the power mover saved the day. I would move the trailer by myself if needed without any worry.
When we changed RVs I sold it for just about what I paid for it, less the shipping costs. That guy has been using it since then.
