Also keep in mind that the payload capacity shown on the door jamb sticker may or may not be close to what it actually is. If you have factory options and added anything of your own, it's going to be less, and then about another 100 lbs for the WDH shank, ball & bars. Factory options like long box, 4WD and extended cab reduce the sticker figure. Toyota may be somewhat different though. Our actual payload capacity of our F250 is about 900 lbs less than what the sticker shows. The only way to know for sure is weigh your TV at a scale and subtract that from it's GVWR.
If a person bought a TT based on dry weight and went by the door jamb payload capacity but have a bunch of heavy options, you could end up with a double hit on the weight. Sure can't rely on RV or truck sales people to tell you what you really need to know.