I have a 2013 Tundra 4.6, 4X4, with the tow package. I imagine it is very similar to yours. I returned in September from 18,000 mile trip across the US from New York to Big Sur, up to Alaska and return. I even went thru the TX panhandle
I have a Surveyor Sport 220 TT, approximately 6300 lbs loaded. The Tundra performed quite well.
For the most part I drove in S4 with the Tow/Haul on. To maintain speed on steep hills I found it necessary to manually down shift to S3 at 2600-2700 rpm. I rarely, if ever allowed the engine to go above 3500 rpm. I averaged 10 mpg and never went above 65 mph. For better mileage, slow down. I have a scan gauge. Watching the instantaneous mpg "taught" me to drive for gas savings.
The weight to be mindful of is your cargo weight capacity. This will limit how much you can carry in the truck along with the tongue weight of your trailer and you can easily max it out.
I used the Reese round bar WD hitch with the dual cam anti-sway. I experienced sway only once, and that was with 30-40 mph headwinds AND a tractor trailer passing me. I highly recommend the Reese setup.
I met one guy in Alaska also with the Tundra and a similar TT. He claimed to keep it in Drive with the cruise Control set. He complained of the sudden downshifting and engine racing on hills
. I thought that was a nutty way to drive, but each their own. I don't recommend it, especially if your son will inherit the truck.
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