Are you talking about hydraulic leveling jacks, as opposed to manual or electric stabilizing jacks?
If so, we don't have them but several camping friends do and they are very nice. I would get the 6 point system, if possible, rather than 4 point. 2 additional ground contact points really help reduce the bounce.
My friend with the 4 point system still generally tries to level his 5th wheel with the lego blocks, then uses the hydraulic jacks to dial it in. He is afraid to let his suspension hang if he is really out of level and one side is off the ground.
My other friend with the 6 point just pulls in to a site, pushes a button and finishes setting up camp. I haven't seen him leave his suspension hanging, and honestly I'm not sure if it could damage something if he does leave it.
Moral of the story, I like them and find that they are far more stable than the the older style stab jacks.
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