What type of power supply do I need for a mobile amateur radio?

I am looking at getting the http://www.icomamerica.com/en/products/amateur/mobile/2200h/default.aspx sometime in the future. I know these things are made for vehicles and I am not getting it for that purpose. I live in a dorm and would be taking it outside occasionally. What type of power supply would I need?... show more I am looking at getting the http://www.icomamerica.com/en/products/amateur/mobile/2200h/default.aspx sometime in the future. I know these things are made for vehicles and I am not getting it for that purpose. I live in a dorm and would be taking it outside occasionally. What type of power supply would I need? Nothing too overkill, college dorm power systems will trip with too much draw.
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