I bought one of the Black Jack hydraulic units to replace my 2 speed Binkley on the 4 Star last week and installed it last Saturday. All I can say is WOW! Wish I had bought one sooner. So if you're thinking about adding one to your trailer this would be $650 well spent in my book. I have a friend who has an electric jack on her trailer and honestly, I've heard diesel locomotives that were quieter than it is when in operation. Mine just sits there and makes the whine like the ad on this site. Moves fast with no effort on my part. Just turn the key and touch the toggle switch. Thanks US Lift Systems for such great products and service. And thanks to Horse Trailer World for selling them the advertising space. And no, I don't work for them and this is a completely unsolicited testimonial.  Gotta go run it up and down again before bedtime. LOL