Laurence is correct. Ideally, you should have your machine as perfectly level as you can, and sitting on some kind of anti-vibration pads that are rated for the weight of your machine.
If you're talking about just moving it once, I found that getting it up on some 2" heavy steel pipes allowed me to roll it where I needed it quite easily. I was able to use a 4 foot long prybar (longer would have been much better) to "lever" the machine left or right, or turn it CW or CCW as needed, and then I used the bar to pry the machine up enough to get the last pipe out from underneath after rolling it off the other two. I was then able to pry it back up for the anti-vibration pads.
However you do it though, keep your toes and fingers out from under the machine, and be VERY careful! Heavy iron is very unforgiving.