Anyone ever heard of these, or, better, seen one in action? I came across this in a Streamline Trailer
SELF-LEVELING SYSTEM AVAILABLE
*****You can order the newest hydraulically-operated, coach-leveling system at the time of your trailer purchase. Every Streamline coach is fitted*with four spots marked "JACK PADS," and each one is drilled and tapped for installation of the Bair Hydraulic Jacks. These self-adjusting jacks can be controlled from a central point using a small hand pump. The use of auxiliary stabilizing jacks is then unnecessary. This one system handles the entire operation. Ask your Streamline dealer for a demonstration.
From post #39 of this thread,
I see one of my fellow Texans is familiar with the system, and, prior to PM'ng him, thought I'd ask if the rest of you knew something about it.