Advice for towing a new TT with a 2004 4-door Tundra

The towing capacity is fixed...meaning yes you can add things to increase PAYLOAD...but you can not increase towing capacity. Towing capacity is all about tow weight...handling and stopping. IMHO...with 30 years and over 250,000 miles experience of rv towing...that is too much trailer for that truck. Keep in mind the tow weight rating is done using a flat trailer loaded with sheet steel NOT a big box with lots of wind drag and side area. I would bet if you do it you will hate every minute of time towing.