I was over at Luther's shop yesterday and he showed me what he calls "a little insurance" for your stuff that goes on the GearTrac. They're just two little knobs that go at the ends using a T-bolt and washer. So just in case something gets loose and starts to slide, you're covered. It was mentioned in Hanover_Yakker's (Chuck Wrenn) recent blog post, but I wanted to reiterate it in a thread of it's own. Photos from Chuck's blog.