Hey guys, I'm looking for a good car vacuum as my girlfriend and I frequent the beach every weekend and get sand here and there(the car, not us) and I want to be able to clean it up so it doesn't just seep down beneath the carpet. My only stipulation is that I need one that runs off of the car's 12v system as I live in an apartment downtown and our underground garage doesn't have power. Everything I find looks no stronger than a dust buster and that just won't do. Any opinions or ideas?