I use a lock on mine, more for peace of mind than anything. It is just a horseshoe shaped steel strap that slides over the neck of the kingpin, and then a straight bar lock through the ends to keep it on there. I think it was about 30 bucks or so. I also put our chairs and barbecue away when we are not using them. I have had enough stuff stolen from me already, I do what I can to at least make it more difficult for theives.
Ellen - Navigator
Boyd - Driver
09 Crossroads Seville VF35CK (Gone)