My 2,500 lb hitch weight puts a whole 10 lbs on the front axle with the hitch in the tow position. Never weighed it with the hitch moved the 9 inches back. With that diesel engine up front, I doubt it will get too light. I just went some 500 miles with it in the maneuver position. Never notice it until I got to destination and Opps. Guess I forgot to move it forward. So no big deal for me.
I've also had the hitch slide while towing. I had the rail pins in backwards and the hair pins prevented the hitch from fully locking. Gets you attention, but no damage. Might sound like it, but it's not gonna tear the rails out of your truck.