On our PUP, we had the 'crank down' type of jacks. Easy, you crank them down until they touch, give them a half a turn more, your done!
On the Que (and I assume all Sunlines), we have the kind that flip down, and the extend out. On our maiden voyage, we had trouble getting the right length for the Jacks. They were either too short, and we wiggled, or I was afraid they were supporting the weight of the trailer.
Is there a 'trick' to properly adjusting the height of these types of jacks?