Ford 1996 Windstar Manual page 254

The rating is based on the carrying capacity of the weakest axle
and suspension component as well as other factors. This is why
it is so important to observe vehicle loading ratings.
Overloading a vehicle punishes components and can lead to
shortened service life or outright failure.
The weakest link in the suspension system defines the GAWR,
and may be the tires. Tires are rated to carry a specific
maximum load at a specific tire pressure.
When passenger car tires are installed on light trucks and
multipurpose passenger vehicles, they are rated at a 10% lower
load carrying capacity due to the differences in vehicle usages.
With the tires inflated to the specified pressure, the total weight
of your vehicle must not exceed the GVWR and GAWR
specified on the Safety Compliance Certification Label. This
includes full fuel tank(s), vehicle equipment, and occupants, as
well as the cargo load.
Gross Combined Weight Rating (GCWR)
The GCWR is the maximum allowable weight of the towing
vehicle and the loaded trailer (including all cargo and
passengers).
252