Towing capacity is a mfg. magical number derived by using base model with 150# driver and 20# cargo.
A real world tow vehicle with stuff, passengers, backpacks, items in consoles, in door pockets, under the seats, in bed of truck etc. will exceed GVWR, RAWR and/or rear tire load capacity long before reaching that magical tow rating.
(My truck has a tow rating of 16,250#....at 14K trailer I am at limits)
Go weigh your vehicle camp ready (you, passengers, all stuff etc.)
Subtract that camp ready weight from GVWR........how much do you have left?
How much for rear axle/rear tires?
Use 15% of trailer GVWR for tongue weight..got room to handle that weight?
Subtract camp ready weight from GCVWR (vehicle/trailer max weight)
How much do you have left? That would be starting point for trailer GVWR.
Then check for tongue weight.