I've been using trailers for time to haul my kids around. But on fathers day my wife bought me a Burley Nomad and told me with gas prices the way they are I'm going to start making the trips to the grocery store. No big deal, I ride twice a day for fun anyway. But now that I'm thinking about it, how do you lock up the trailer?? I have a U-lock and a short cable for my road bike but whats the best way for locking a trailer??