We have the SteadyFast system on our Elk Ridge. The front is rock solid, no wiggle when DH gets out of bed, and I'm a light sleeper. There is still some wiggle when one person is at one end of the rig and the other is at the other end, moving around. The manufacturer recommends adding a set of scissor jacks between the back landing gear and the wheels, and mounting the SteadyFast to that instead. Scissor jacks are apparently more stable than the standard jacks that come on our rigs. That said, the overall wiggle is GREATLY reduced. We also bought and cut the recommended wooden blocks made of pressure treated wood (two, 4x6x14 side-by-side under each foot) rather than plastic leveling blocks, which the SteadyFast feet cut into and were not as stable. The product is very well made (in America). The instructions are clear and fairly easy to follow. It will take two people to install, as there are measurements that need two people to make. We also had to make a minor adjustment to our gas line (add an elbow) so that the steadyfast bracket would not interfere with it.
We will see how well they hold up to straighline winds. Last month our trailer was forcably shoved off its blocks by some high winds and one of the landing gear broke. It is still at the dealer for repairs, so I am not sure if the SteadyFast was significantly damaged or not. I do know that the support arm did push a dent into the j-wrap as the leg broke. See this thread for the pic: //heartlandowners.org/showthread.php/23612-bent-landing-gear-thanks-to-straight-line-winds! We did not have the rear landing gear down. I don't think anything would have stopped this from happening.
Hope this helps!
Erika