we have two garages side by side. no, not a '2 car garage' they have separate doors and entrances etc., It's a duplex but our family lives in the whole thing. Anyway, we have a model S already with a Gen 2 Wall charger and we are about to put a model 3 in the other garage. I'd prefer not to have another wall charger installed but the cable on the existing one isn't long enough to reach the other garage. What are my options? Is there such a thing as an extension cord that will work?