Cool, but i think osha will probably have a problem with that. What’s to hold the jacks vertical while your working on it? Yeah it’s great it flips to the flat spot but what if something shifts and rocks it forward? Cool but kinda sketchy.
Seriously though, assuming it's on firm level ground, it ain't going anywhere unless it gets hit by another truck trying to park beside it or some other huge force.
I wouldn't want to be too close when someone is backing them up though. One side could slip a little bit and either shoot out horizontally towards the rear of the trailer, or not reach it's flat spot at the same time as the other one.