The HD one can be made to operate the new "more secure" or digital openers. Do a search on here or one of the other forums. I did it and it only took a short amount of time. MUCH easier and safter to just push the flash to pass on the handlebars and watch the door open.
If one knows how to solder it's pretty easy to make the Harley system work with one of the more recent garage door openers. It basically involves running the wires from the Harley receiver NOT to the door opener motor unit, but to the smart wall switch. You locate the two contacts for the actual open/close switch on the circuit board and solder the Harley receiver wires to those contacts. There are also solutions you can buy that utilize the MyQ system of the Chamberlain opener, but the simple solution mentioned earlier is free and only takes a short time to route and solder the wires.
Another alternative I've used is to mount one of the door opener's own transmitters in the bike, in my case inside the fairing, add a SPST pushbutton switch to the location of your choice, and then solder two wires to the circuit board of the transmitter and route to the pushbutton switch. In other words, similar to what Alan posted but adding a remote switch to eliminate having to open a glovebox door to operate the opener.
As always, there is more than one way to skin a cat.
Jerry