Only thing I can relate to is the same slider.I had to buy the pullright height extenders for my truck.( 2011 f350 srw)I only had three inches clearence which is not enough.You wont know that till you know that (or hear it)..I now have 6-7 clearence and where I park mine and the lay of the land I come within 1-11/2 inches of my rails when parking and pulling out.But you never know what road you might end up on with a bump in the right place that will bring you close to your rails.Make sure you have 5-6 inches imo..