I use the trailer's stabilizer jack wrench on my ProPride WD jacks and it works well as I count by turns, and not necessarily inches, which enables me to get where I want without measuring with a third hand. Standard set-up for me is about 50 turns. Works for me, maybe not for others.
But since it's not very practical to hit a CAT scale every time you hitch up, I let the trailer tell me if that starting point is good. Sometimes when I'm traveling a little heavier, 50 revolutions aren't enough, and I still get a little instability on a bump or in a curve. At these times, I crank an additional five turns and all is right in the world as the rig finds it's rails again. I've never had to go above 55 revolutions and I've rolled close to gross more than once.
2004 Dodge Ram 2500 5.9L Cummins 4WD (SOLD)
2010 Classic 30