I'd love to get something like that going. Maybe down by Crissy Field on a weekend sometime. I'd like to know if anyone in the city has done this kill switch thing too. I garage my truck, but it would make me feel a lot better parking it around the city with a good kill switch. If you know any others here in SF lets try and get something going. I also don't know of any trails around here as I just got my truck back down here...