OK, first post on here as have been lurking for the past couple months, and learning quite a bit from everyone’s posts, but also learning should have started researching long ago. This brings me to my...
Payload with TT and a WDH is not as big of an issue as axle ratings/tire ratings and you will be under on those.
IMHO.......go weigh truck 'camp ready' Then subtract that weight from your trucks GVWR (10K)---equals weight you can add before reaching GVWR Subtract axle weights from GAWR....room to add how much weight