I agree with you 100% Gary!
Anything that lifts by a lever type means always wants to push away from the saddle end,(the casters roll as you jack). So I would think when you are using one of these on each side it would push away from each other,great, as long as it doesn't catch up somewhere.
I had looked into a MaxJack, portable 2-post lift,hooked together by one line, so they lift at the same time. They don't look stable enough where they park on the floor.
Brian