Today we're going to be taking a look at the Atwood AMPlock Trailer Coupler Lock. This is designed for 2" or 2-5/16" couplers. The part number is AT89005. This could be used for anything up to 4-11/16" wide and 3/4" tall. While it's geared toward more of the flap lip style as we have here, it's also going to work with some of the rolled lip styles. The AMPlocks are going to offer us maximum… see more >