I wouldn't consider that for OBA at all... who knows what that pumps even rated it. I've seen things like that take 20+ minutes just to get a normal car tire back up to pressure.

If you want to spend under $100 for OBA, something like this would be a bit more applicable:
http://www.viaircorp.com/OffRoad/90P.html
http://www.amazon.com/Viair-93-VIAIR...6492731&sr=1-3


That way you at least know what kind of pump and ratings to expect.