Ford 2006 F-250 Owner's Manual page 148

Tires, Wheels and Loading
Example only:
Cargo Weight – includes all weight added to the Base Curb Weight,
including cargo and optional equipment. When towing, trailer tongue load
or king pin weight is also part of cargo weight.
148
2006 F-250/350/450/550 (f23)
Owners Guide (post-2002-fmt)
USA (fus)