This should have included the older 94-97 Turbo Trucks, They have better or equal payload numbers than the Super Duty version because they were lighter, Ford did not update weight labels in 99 and 2000 trucks and will show low payload numbers. 99 and up are easier to tune with tuner and have intercooler.
Better - 1999 - 2003 Ford 7.3L Powerstroke. Work horses! The transmissions on these are not as tough as the Chevy Duramax Allison transmissions. If you buy a higher mileage used 7.3 powerstroke plan on a transmission rebuild. Get a quality transmission rebuild with towing parts and the transmissions can be made pretty much bullet Proof.