Decreasing towing fatigue in Ram 3500 4x4 single

As long as you own a 5th wheel, you're always gonna have SOME pin movement in the box. You can tighten up the insides of the hitch to grab onto your kingpin a little tighter to keep the front/back movement down to a minimum which you would notice when stopping or starting. Take it to an alignement shop after you get all the worn out parts replaced for a fresh alignment. It will likely drive like the day you bought it.