I have an F-150 4x4 with the E-Boost engine. The max cargo is 1411 lbs. The max cargo varies with accessories that are included on your individual vehicle.
My 5000 lb. dry weight TT weighs 6600 lbs when fully loaded according to the CAT scales. It has over 700 lbs of tongue weight. The DW and me with the dog add another 500 lbs. This leave about 200 lbs for toys, truck cap and camp gear.
If you know the weight of your family, toys, camp gear etc.and the stuff you are adding to your TV , and you have a rough idea of the loaded TT tongue weight. You have an idea the cargo capacity you need.
Almost every vehicle can tow far more than it can carry.
Good luck.
