I was thinking B&W for my new LB TV... but saw that Demco has a fixed 21K UMS hitch for the Ford Prep. Anyone using this model? Looks about 25# heavier than the B&W 20K#, and 25# lighter than the B&W 25K# model. I have a Demco autoslider now in my SB and haven't had any issues with the jaws. Anyone used both a B&W and a Demco? - preferences on the head/jaw designs?