Scissor Jacks

i use a cordless drill also. Paid $19.00 @ harbor freight and use an extension with a socket adapter on the end. Works great and takes only seconds to fully raise and lower.

I have scissor jacks on my class c, two on the front and two on the back.
The two on the back will level the vehicle within reason but the two on the front will actually lift the front end, I don't use them to lift the front but they will do it.
I use a cordless drill to lower and raise the jacks.

If your parking brake is on the rear wheels, setting it even when on level ground may reduce rocking a bit. Dunno how much it'll help if it's on the transmission.

Things that stiffen the suspension, like a bigger rear sway bar, help too.

Jim, "I thought opening the door for a lady was the polite thing to do, but she just screamed and flew out of the plane."

That's the problem with hydraulic levelers on a Class C. The frame is narrow, so lifting one side lifts the other nearly as much. What's worse, the hydraulics are also somewhat toward the center of the coach length-wise. So lifting the rear also has a tendency to lift the front.
Scissors jacks should help a lot if you can get them to Corners. Not quite so much if contact points are limited to the chassis rails.

I have two jacks on the rear of my 30 foot coachmen for stabilization. When I was trying to raise only one side a small amount to level, I was amazed to find the other side was lifted as well. So one jack raised the rear the same amount. Never knew that.

Scissors Jacks like these?

You Betcha they'll work. Only to Stabilize, though, don't expect them to be strong enough or crank-easy enough to Level a Class C. A little travel trailer is steadier with its jacks down at the corners than a Class C is with its hydraulic levelers deployed. That's because the scissors jacks are way out at the corners.
Save-A-Jack? This may be just me, but if I'm going to protect the jacks from dirt and damage by sliding them out of a bracket then storing it someplace for the road... Why bother buying a pricey gadget that doesn't help with the inconvenience of stowing the jacks? On Amazon, where I got the picture above, S-A-J for two jacks is about the price of a set of Four scissors jacks.