I would take your particular configured RAM 1500 to a CAT scale and weigh it with full fuel & passengers. Add any weight to the CAT gross weight not accounted for (cargo, passengers, etc.). The CAT visit will tell you how much "available" cargo capacity (TV GVWR - CAT gross weight) for a TT's loaded tongue weight/WDH weight...., also available rear axle weight (TV rear GAWR - CAT rear axle weight). CAT will take 3 minutes and $9.
Very few TV's exceed their specified "Tow Ratings", it's the TV GVWR and/or rear axle weight limits that get consumed first.
I would walk back into the RV dealership with your CAT results and then work with "loaded" TT weights........, unfortunately many RV dealerships tend to ignore TV & TT "loaded" weight conversations.
Hypothetical loaded 32BHDS: (8,582lbs UVW as-shipped) + (700lbs cargo, no fluids) + (50lbs dealer battery, etc.) = 9,332lbs
Loaded tongue weight at 9,332lbs = 1,213lbs - 1,400lbs (13% - 15%)
Bob
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2016 GM 2500HD 6.0L/4.10
2018 Jay Flight 24RBS
2002 GM 2500HD 6.0L/4:10 (retired)
2005 Jayco Eagle 278FBS (retired)
1999 Jayco Eagle 246FB (retired)
Reese HP Dual Cam (Strait-Line)