I'd stomp on the brakes and first understand the capabilities of your Sequoia. Payload will be reached before towing capacity which is a pie in the sky number calculated by pulling a flat trailer with weights and a 150 lb driver.
So you need to find out the payload of your TV, and understand what weights subtract from it. Take the advice given above and post the numbers either from your door jamb sticker or manual - pay close attention to the one that states the total weight of passengers and cargo not to exceed xxxx lbs.
I'm betting you won't find something agreeable that's able to be towed by your vehicle.