No, not doing that, I level first, then secure with the stands. If I have them too tight, or too loose, then the floor squeaks, and the door sticks. Usually a 1/4 turn on the wrench one way or the other does it. I know those things wont support the weight of the trailer, and they will snap off if I do. I run them down with my drill at all four corners, then grab the wrench and give a snug up turn, and then check that the floor is quiet and the door opens and closes smoothly. This tells me I don't have a bow in the frame. If I put too much pressure on the frame from the jacks the door wont close smoothly, and catches, and if I don't have enough pressure, then the floor squeaks.
It's the wiggle that has me concerned, I saw the trailer physically moving sideways on the jacks.