FORD 2003 F-150 v.1 - Manual (Page 164)

Towing trailers beyond the maximum recommended gross trailer
weight exceeds the limit of the vehicle and could result in
engine damage, transmission damage, structural damage, loss of vehicle
control, vehicle rollover and personal injury.
Engine Rear axle ratio Maximum
GCWR-kg
(lbs.)
Maximum
trailer
weight-kg
(lbs.)
Regular Cab 4x2 w/automatic transmission
4.2L 3.31 4077 (9000) 2132 (4700)
4.2L 3.55 4530 (10000) 2585 (5700)
4.6L 3.08 4530 (10000) 907 (2000)
4.6L 3.31 4763 (10500) 2812 (6200)
4.6L 3.55 5209 (11500) 3261 (7200)
5.4L 3.31 5443 (12000) 3447 (7600)
5.4L 3.55 5897 (13000) 3900 (8600)
5.4L 3.73 6124 (13500) 3992 (8800)
5.4L 4.10 6803 (15000) 3991 (8800)
SuperCab/Super Crew 4x2 w/automatic transmission
4.2L 3.55 4530 (10000) 2495 (5500)
4.6L 3.08 4530 (10000) 907 (2000)
4.6L 3.31 4763 (10500) 2676 (5900)
4.6L 3.55 5216 (11500) 3130 (6900)/
2994 (6600)
5.4L 3.31 5443 (12000) 3311 (7300)
5.4L 3.55 5897 (13000) 3765 (8300)/
3628 (8000)
5.4L 3.73 6124 (13500) 3900 (8600)
5.4L 4.10 6803 (15000) 3900 (8600)
Driving
164