Llightweight TT to tow with Toyota Sequoia-Passport 2890RL?

I think you should be fine, especially if you have the tow package. I have a 2008 Tundra, same motor, trans and chassis as your Sequoia and my TT is 5600 dry. It tows fine over the hills of southern Oregon.

The only brief moment of worry on a recent trip was on a short section of highway that is literally a few yards from the beach. Very windy, but I don't have an anti sway, only WD.