Today we're going to be taking a look at the WHRZT! GPS Trailer Tracking Device Breakaway Lid. It measures 5 1/8 inches long by 3 3/4 inches wide. Part number is WBB-100. Here's our breakaway kit installed, and this has the WHRZT! software right inside. It's really hard to tell, and that's kind of the secret of it. You don't want everybody to know that the trailer's being tracked.… see more >