Originally Posted by djemgoss
I just got a ROO 21SS and I had a Toyota 4-Runner and it had a tow capacity of 5000 lbs and choose not to pull it with that! You will exceed your Highlander tow capacity by a lot after you load it up with all you gear and people in your SUV. It would not be a safe idea to even try and tow a TT with your Highlander!!!
I have that exact setup. 2012 4runner - with airbags installed + 2016 21ss. The 4Runner pulls ok on flat roads and does struggle on inclines. Pretty sure I am at the max and worry constantly about the wear and tear on the truck. I am actively looking to upgrade to a full sized suv for more wiggle room with the weight.
That said, it looks great when setup.