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

I am like Fireup. I am not an over weight person, so there is plenty of room under the rear of the coach for me to change the oil. I lift the rear a few inches with the Quadra bigfoot levelers, but not enough where the wheels will get in the air. Even if the levelers were to fail which I doubt there is plenty of room where a person could still be safe working under the coach.

Now the front is a different story to service the generator. My generator is on a electric slide, so it makes it easy to service.