I don't use a slider in my short bed but I do use an Andersen flipped back which gives me a little more clearance. I can turn at a full lock going forward without hitting. I can't do 90 backing up but I don't know that I ever need to. I do really like the hitch - I use the rail mount version. It's light and very simple. I'm completely sold on the design and will never use a standard fifth wheel hitch again.
B&W always gets talked up as a good brand and I'm sure it's a good hitch but I don't have any personal experience with it. Some swear by the high end air ride hitches but I also have no experience there.