Not sure why you would buy one when you already have one on your MH. While it takes a little work to get up to 115 for my previous front tires, it's not that hard. Buy a good air line, a dual chuck, and quick connects that go on you air line/tank drains and you're good to go.
Only tire I know of that requires 150 is on a jet airplane.
A 400HP compressor might be overkill??? - JMHO