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FIrst a lot of 4 legged levelers are really 3 legged, I will explain
The problem I have with the tripod system is this.. That front-center jack is mounted on a cross member.. This cross member is not as strong as a frame rail and.. what's worse, the jack is at the absolute worst (Weakest) point, namely the center of the rail.
It just looks a bit.. Well.. Flimsy to me. And I have heard of them bending the cross member.
Now. if you take two jacks, bolt one to each frame rail, run the hoses to a "T" fitting, and the third leg of the "T" back to the pump.. You use the self same pump and controls.. It works JUST like a 3-jack system.. But you have the strength of a 4 jack system.. The jacks are attached to the frame rails, the strongest rails on the chassis, And the odds of them bending go way, way, down.
And that... Is exactly what is on my coach Power Gear hydraulics
NOTE Not all 4-jack systems work this way.. Some each jack has it's own control valve and hose back to the pump.. And in some cases if the controller is mis wired, bad things happen with those systems.
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Home is where I park it!
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