I know you said hydraulic but here's what I did on my 07 Wildcat. It does have hydraulic front gear and slides. Simply for cost and ease of install, I went electric.
I purchased 2 electric tongue jacks through Walmart's website for only 99 bucks each. I ran a dedicated 10 gauge wire through a 30amp circuit breaker to the rear just aft the rear axle.
I used 2x4x.25" tubing for frame mounts that I welded to the jacks. I also cut down the jack tubes making them 7" shorter. I outfitted the jacks with the auto retracting 6" Flip feet @ 39 bucks ea. The assembly then is bolted through the frame with 1/2" bolts. The top of the mount rest tight against the top flange of the frame making it rigid.
Once wired up I am able to lift the entire coach off the ground if I want to. Each jack is independent and are still able to be manually retracted if there's failure. The jacks even have 2 LED lights that shine down on the foot for night time ops.
Here's some pics.
*Current: 2005 Ford F350 Crew Cab Dually 6.0 diesel 4x4*
*Retired: 1987 F350 Crew Cab Dually 6.9 turbo diesel
2007 Forest River WildCat 32QBBS