If you have a Class C, especially on a Ford chassis, upgrade your Front and Rear Sway bars. That's right, Sway Bars. Then simply use blocks to drive up onto for leveling. Remember to block under BOTH rear tires if you need lift there.
Our coach came with HWH hydraulic kick down levelers. They level but don't stabilize to any great degree. New Sway Bars did more for stability than the levelers did.
A Class C will NOT go rock-steady like a Trailer with stabilizer jacks at all four corners. That's because so much of its weight is still on tires and suspension.