Help making a decision on truck purchase.

We’ve been towing our loaded 7200 pound 28 foot fifth wheel with our 2001 Toyota Tundra for more than 20+years without incident. The 5.7L Tundra has even more capacity for towing. The original Tundra was advertised as a truck that was 7/8 of a full size half-ton which is what I loved. All the capabilities of a half-ton and easier to park in tight spots. My payload is 1924 lbs which was more than many of the other half-tons of that era. The 4.7L is super reliable but as others have mentioned, very thirsty for fuel. I average 7-8 mpg while towing. Even when not towing I get around 13/16 mpg. I like the naturally aspirated engine of my Tundra for its reliable longevity but if fuel economy is a primary concern go with the 3.5 Ecoboost from Ford.