LegUp LandinGear Harley Trike Motorcycle Stabilizer Bagger Dyna Softail Kit FLH marked dyna on back, customer said he took it off a flh, sorry dont know details on it...guy bought a bike with it on & had shop take it off... said it was barely used, we bought a bunch of stuff off shop, selling as pictured maybe good for custom applications also! or can fab or buy other parts you need for other applications. looked at their site, looks like a new kit is 3500.00
more than welcome to pick up at shop & save shipping.
more info from company
Do you sometimes have difficulty managing your bike at slow speeds? Backing up? With a rider? Many do! That is why we came up with LegUp™ LandinGear!
The Patented LegUp™ design was created for those who for whatever reason are concerned about, or unable to hold up these 850 lb monsters as they come to a stop. 
Older riders, bad knees, bad hips, bad passengers (couldn't resist!), or any other reason someone might want a little help keeping the rubber side down... This will do it!
Our unique retractable stabilization system can help many riders stay on their bikes rather than giving up the sport they love, or resorting to a trike. Using a computer and a pair of pneumatically controlled wheels, LegUp™ deploys these wheels (if desired) as you slow to around six MPH, and automatically retracts them if you accelerate over that speed.
Over eight years ago, Chopper Design introduced the original LegUp™ LandinGear system. Since then, thousands of riders have been helped by it's ability to stabilize their bikes at slow speeds. The GENERATION II system we use today is significantly stronger than it's older brother. An on-board compressor and a captive air tank, makes this system amazing to watch!
The wheels deploy and retract based on wheel speed; with the .25 second deployment time, we are able to bring the wheels down at a very slow speed (5-6 MPH). The onboard computer controls everything, and a Handlebar switch housing with LEDS allows the rider to communicate with the system and allows the system to talk back!
The wheels are mounted under the rear floorboards, and tuck up neatly just in front of the bags when not deployed, allowing the bike to be leaned and handle exactly as it always has. You can't do that with a trike or other hokey outrigger systems. The installation Requires no major modifications to the existing bike at all !!
videos of them working
https://www.landingear.com/video.php