[sander]

I think about this each time I go to an autocross, too. I'm not so worried about any of the other drivers/owners - I think you can trust them like you'd trust a family member.

What I do worry about, though, are people who are not club members "wandering" in and helping themselves to free torque wrenches. These are the same guys who do donuts at our site just for kicks. I don't know how many unwelcome visitors would be on the track at a DE, however.

But to answer your question, I have a Master lock and a bike chain that I use now and then just to keep things from walking off by themselves. I think the easiest precaution you can take if you're worried is to just cover everything up with a tarp. Kind of like your mother used to say, "Don't leave any valuables in plain view."