I was happily using a cordless Black and Decker drill until after about 3 months, I was raising a stabilizer and AC runoff suddenly dripped and ruined it. Black and Decker sent me a replacement, but while waiting, I got in the habit of using my corded drill. (I bought it during a trip to repair a poorly installed bed brace on my last camper.) To my way of thinking, using my extension cord is not more of an ordeal than remembering to charge a cordless. Anyway, I have the extension cord out for departure anyway for checking and airing up my tires. All that being said,
this is all you need.
