What do you DIY'ers use to jack and secure your rig?

What I use

We use these in a 20 ton version. We lift the bus with the air levelers, reach under, keeping all body parts except one arm from under the coach, and slide these under the jack points. Once in place, we screw the jacks up manually until firmly loaded.

And yes, we use them under the Sprinter also. Air suspension will kill you in case of the Prevost, but a 12,000 lb Winnebago will kill you also.