Deposit down- Now I'm no sure I can tow it. manual not clear

Tundras towing rating is based on a entry level vehicle, with 1/4 tank of fuel and a 150 pound driver. Everything else is subtracted from the towing rating. Now, load up like your going camping and hit the scales. Subtract the scaled weight from its GVWR as listed on the drivers door post. You now have how much weight you can have for tongue weight. Tongue weight is around 12% of a trailers loaded weight. In your case use 12% of the trailers GVWR. Are you over or under?