I just purchased a 2023 37PP with 580 miles on it now. I currently feel the "thumping" feeling in the steering wheel and floor. It's currently at the dealer. I took the two main techs and shop foreman on a test ride, and they all felt the thumping. The tech said he posted this issue on their tech line and waiting to see if anyone has some input before taking things apart. I told him I believe it's the suspension/shocks. I will call them Monday and follow up.
I have noticed that it seems to start when the truck is driven for a bit/warmed up (maybe suspension cycling heat). I feel it when taking off from a complete stop, coming to a stop and when the suspension cycles up from a nice smooth dip.