[NH_Bulldog]

You need the cargo sticker to know capacity. For reference, I recently traded my 2015 F150, but it was set up for max towing as a factory option. After aftermarket upgrades I was comfortable towing my trailer, but we need more information from your friend.

Based on the sticker you posted, he has 20” wheels, a 157” wheelbase (long bed), 3.5L twin turbo V6, Crew Cab 4x4, and a 3:55 axle ratio, but that’s all we know.

As far as the engine revs going down a hill, it is perfectly normal for that 6 speed transmission in tow/haul mode and is intended to use the powertrain to keep downhill speed under control instead of smoking the brakes. I think redline is like 6500 rpm and as bad as it sounded it never got close. My wife would freak out when it happened so I would typically use SelectShift and manually run the gears in hilly areas. The whine from the passenger side front seat is worse than any sound the truck made.

Added: my issue was NEVER towing power, that set-up is more than enough for towing. What he HAS to be concerned about is cargo capacity and handling performance with the inherently soft and squishy suspension designed for ride comfort and little else.