The kingpin box is adjustable to your vehicle height, it all depends on what you have and how you normally load your rig, set it and forget it. The landing gear holes are for terrain adjustment, and so you don't have to try and lower all the way to the ground with the winch. I leave around 5" or so of the gear lowered all the time and drop the last 8 to 10 inches when I set up so I have tilt forward room when the TV is disconnected.
-Todd and Sherri
-2006 F250 Super Duty King ranch Diesel
-2012 Windjammer 3008w
-Equilzer 1200lb hitch