Please help me identify 5th wheel towing issue.

bpounds, yes those weights are guesstimates. I have not weighted it but it did seem to ride better when I had a 3/4 full water tank. So you may be on to something. How to load up more pin weight? Got a full basement and fully loaded under bed...hmmm. I may have a way to weigh pin at home with a scale that I had from TT. Pin weight dry is 1660lbs and my guess was a little high on trailer weight. GVWR is 12K so I am under that probably closer to low 11K which still puts me at about 20%