I'm interested in this as this is my first trailer with a slide. On mine - when it reaches its limits it makes a "clicking" noise and stops moving. We have little to no indication that it is at its limits before the clicking starts.
I could record the sound and post - but have just assumed that when you hear the noise, stop pressing the button
I've advised the DW to stop pressing the button "as soon as humanly possible" when the clicking starts.
-Chak