<Trying VERY hard to stay within the PG guide...>
Our favorite campsite has pads with a good (extreme??) bit of fore/aft drainage. Normally, we don't unhook, just use the tounge jack to level it fore/aft, and reley on 6000lbs of tug to keep everything solid.
Long story short, I unhooked to run the kayak down to the lake, and forgot to block the wheels. Not a problem until we both went to bed and uh..... we're still newlyweds
11:00 at night, and I'm trying to push the trailer back up the pad...
Lesson learned, I'm adding 2 rear jacks when I do the axle
lift, both to stabilize it left/right, and to keep the tounge jack FIRMLY on the ground.