Spa is largely correct, but as someone that has done things outside the published envelope for most of his life, the published towing limits are important, but not the end-all. Payload is Payload and that is true, but towing capacity (as I used to rate it for two different OEs) is more about driveline warranty. That is why you can't bolt on an improvement.
A load equalizing hitch (WDH)is a requirement for any trailer that is of any size relative to the tow vehicle. As to whether you need the sway control or not, that is a tough call, since you give no particulars in the TT. My advise? If you can afford it, buy the sway control now and you will not regret it.
Then there is GCVW. That can be a stopper as many states will cite for exceeding that. Read that off the door tag - Today. Get the Tundra loaded with fuel kids and dogs weighed - Today. On your way home from picking up the trailer, get it weighed. (See a running theme here??) After you get the rig loaded for your first excursion, get it weighed. You have just spent ~50$ that could save your life. (See a running theme here?? Do I need a BTDT??) Then, take the new rig into a BIG EMPTY parking lot and try to put it in a parking slot. Lots of campgrounds have few or limited pull though spaces. Unless you have a lot of towing experience, this is something you should schedule. If you can have DW as a observer, have your had signals or radios organised before you start.
Can you exceed any of these numbers and survive? Yes, but you have to be certain that the brain is engaged before you even hook up....
The way that is guaranteed to get you hurt is to push things you can't control like weather and traffic. Remember, If you get behind, Slow Down.
Do Not plan you first excursion into the Smokies. head for the beach or somewhere else that is flat.
If the truck has a 7 wire RV connector, it is most likely wired for a brake controller. You may have to ask a Toyota dealer where to find the cab end of the harness. On your first stop, if you can tell the trailer is back there, the controller isn't set right.
Much of my towing was three ton racing sloops that stood 11' over the road, but my travel trailers were worse.
Safe Travels
Matt
