The hydraulic levelers are just that, levelers, they can and will lift the entire coach off the ground, however you really should try to keep at least the rear wheels on the ground! They are operated by an electric powered hydraulic pump. Big Foot is the brand the FR uses. The stabilizers are just to keep it from bouncing around, you still have to level the RV with something under the wheels, like wood blocks or
Lynx Levelers.
My Coachmen Concord has the Big Foot system and it works quite well. I typically run mine manually rather than depend on the automatic setting. It has a tendency to be a bit too aggressive for me.
Aaron