Ford 2009 Flex Owner's Manual page 252

Tires, Wheels and Loading
GCWR (Gross Combined Weight Rating)/Trailer Weight
Class Maximum
GCWR
Class I towing 6900 lb
(standard) (3131 kg)
Class III towing 9357 lb
(optional) (4245 kg)
*
For towing trailers up to 3500 lb (1588 kg), use a weight carrying
hitch and ball which uniformly spreads the trailer tongue loads through
the vehicle's underbody structure. For towing trailers over 3500 lb
(1588 kg), up to 4500 lb (2042 kg), it is recommended to use a weight
distributing hitch to increase front axle load while towing.
GCWR (Gross Combined Weight Rating)/Trailer Weight
Class Maximum
GCWR
Class I towing 7050 lb
(standard) (3199 kg)
Class III towing 9521 lb
(optional) (4320 kg)
*
For towing trailers up to 4500 lb (2042 kg), use a weight carrying
hitch and ball which uniformly spreads the trailer tongue loads through
the vehicle's underbody structure.
WARNING: Do not exceed the GVWR or the GAWR specified on
the certification label.
WARNING: 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.
252
2009 Flex (471)
Owners Guide, 2nd Printing
USA (fus)
FWD
Trailer weight Tongue load
2000 lb 200 lb (91 kg)
*
(907 kg)
4500 lb 450 lb (204 kg)
*
(2042 kg)
AWD
Trailer weight Tongue load
range
2000 lb 200 lb (91 kg)
*
(907 kg)
4500 lb 450 lb (204 kg)
*
(2042 kg)