Yup. Just get a 50 to 30 adapter then a 30 to 20.
It's very important to get a good 12 gage extension cord. Also the longer the cord the harder it is to pull power threw it so if you only need 25' just get a 25' not a hundred. Keep the ac off. The rest should be fine. If you try to pull to much you can feel the cord get warm.
__________________
|