Ford 1999 Explorer Owner's Manual page 170

Driving
Trailer towing table (4x4 manual transmission)
GCWR (Gross Combined Weight Rating)/Trailer weights
Engine
4.0L OHV
4.0L OHV
4.0L OHV
4.0L OHV
4.0L OHV
4.0L OHV
Notes: - For high altitude operation, reduce GCW by 2% per 300
meters (1 800 ft) elevation. For definitions of terms used in this table
and instructions on how to calculate your vehicle load, refer to Vehicle
loading in this chapter. Maximum trailer weights shown. The
combined weight of the completed towing vehicle and the loaded
trailer must not exceed the GCWR.
Towing a trailer over 1 588kg (3 500 lbs.) requires a weight distributing
hitch.
170
Rear Maximum
axle GCWR-kg
ratio (lbs.)
3.27 2 721
(6 000)
3.55 2 948
(6 500)
3.73 3 175
(7 000)
4.10 3 175
(7 000)
2 948
3.55
(6 500)
3 175
3.73
(7 000)
Trailer weight
range-kg
(lbs.)
(0-Maximum)
2-door
0-880
(0-1 940)
0-1 107
(0-2 440)
0-1 334
(0-2 940)
0-1 334
(0-2 940)
4-door
0-1 007
(0-2 220)
0-1 234
(0-2 720)
Maximum
frontal area of
2
trailer-m (ft
4.64
(50)
4.64
(50)
4.64
(50)
4.64
(50)
4.64
(50)
4.64
(50)
2
)