Bogie,
Ours is a '18 and am not aware of any controllers for it unless they became avail cple yrs later. Remote controllers? But the system is a Schwintek and at least on ours, has 2 separate switches. One for the main slide and another for the bed slide. Was told upon delivery not to stop either when opening or closing until they have reached their "stopping" point. If we did stop in between, could cause issues, so we never have.
I hope to upgrade this system tho to the Vroom slide out system instead IF I can get ahold of them.