For starters, it looks like the rear end of your truck in pic sits awfully low w/ camper hooked up. King pin is 4" ahead of axle? IMO, that's too much. Should only be couple inches. I have a 5th Air Borne hitch on 5er and Reese 16K non slider w/ 4-way pivot head and don't get much in way of chucking ( had this exact set up on our '03 F250 SD as well as w/ current truck) Our pin wt was no where's near yours despite a heavier coach overall. Now here's a thought. What is the measurement of the king pin itself? You mentioned you bought the set up used. It's possible that being an '07 coach the king pin could be worn which would cause it to be sloppy in truck hitch. (sorry just re-read where you measured that). Jaws themselves on hitch may be worn (adjustable---IDK as I'm not familiar w/ the workings of that hitch). Weights are a tad high on truck ,but nothing too outrageous.
Do you have a local RV dealer that you have a good report w/ service dep't? NOT CW. Ask the techs for advice as well or have them go w/ you on short ride. Keep us informed of your results.
