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Are you talking about the stabilizer jacks or the landing gear?
One of the more popular systems out there today is called "Level Up" by Lippert and it consists of the two landing legs and 4 other jacks. All are hydraulic and can be remote controlled. I will attach a video presentation link so you can see how they work and some of the issues you might experience and how those are resolved. If you think this is one you might consider, please get back to me and we can go over costs. Hope this proves helpful here. Any and all follow ups are included in our fee and expected.
Here is another that might be helpful here......... https://www.youtube.com/watch?v=BJ_26DxE2Pk
You might find this blog useful where they discuss these and some of the costs. I think those are somewhat higher today and will check tomorrow with my supplier. http://www.heartlandowners.org/showthread.php/16794-Lippert-Level-Up-System
Here is a link to a different Lippert system that is less money and uses electric jacks. Depending on the weight of your RV this might be a less expensive choice. http://www.amazon.com/Lippert-Components-358590-Leveling-Wireless/dp/B00PMAIG54/ref=sr_1_fkmr0_1?ie=UTF8&qid=1447821736&sr=8-1-fkmr0&keywords=Lippert+level+up+system