I have a 2019 Expedition MAX as a secondary tow vehicle for my 7000 pound boat.
Power has never been a concern. Actually is nothing short of impressive.
MPG solo is bette than the 6.2 Yukon XL Denali it replaced.
A couple of real complaints. It gets REALLY hot towing through the mountains in Colorado. Like 245* hot. Both engine and tranny.
It sucks fuel when towing. Coming home from the lake this weekend was 8 MPG on flat ground with no wind at 75 MPH.
Towed a very light 17’ fishing boat back from North Dakota a few weeks back. 75 mph with some wind and I was at 9 mpg. There really doesn’t seem to be a huge difference in MPG when towing regardless of weight.
And pretty much all the 3.5 right now have the recall for the cam shaft phasers. Mine sounds terrible at start up and it’s been on the parts list since September.