I have a 2017 Tundra and tow my Airstream that weighs just about 6500 going down the road. I tow in 5th and am not afraid to select 4 or even 3 going down grades. I also downshift on steeper hills and am not afraid of revving it a little. I had a 2008 and both have been excellent for us. I do not like the integrated brake controller that came on the 2017. Took it out and installed my Prodigy that works great. You have a good TV.
2017 Toyota Tundra, Double Cab, 5.7L V8
2006 Airstream 25 FB SE
Equalizer Hitch