When staying long term I use a King pin stabilizer, x chocks, screw supports under the rear. Works great. The king pin stabilizer also helps stop the longitudinal motion also when properly positioned. X chocks also help that. One other thing that would probably help is the new step setups that reach the ground. I have the old stile flip down step and I put a jack under it to help keep it from rocking the trailer when I go out to walk early in the morning. I've never tried the Strong Arm supports so I can't comment, but many people seem to like them.
I do have a four point auto-leveling system.
2017 Crusader 315
2016 Boston Whaler Montauk 150
Former Montana owner
Colorado Cruiser, Over the Pass and Down the Hill