Dodge 2010 Dakota - Manual (Page 257)

When to Use TOW/HAUL Mode
When driving in hilly areas, towing a trailer, carrying a
heavy load, etc., and frequent transmission shifting oc-
curs, press the TOW/HAUL switch. This will improve
performance and reduce the potential for transmission
overheating or failure due to excessive shifting. When
operating in TOW/HAUL mode, top gear is disabled and
some shift patterns are modified. On vehicles with five-
speed transmissions, shifts into Overdrive (fourth gear)
are allowed during steady cruise (for improved fuel
economy), and automatic closed-throttle downshifts to
third gear (for improved braking) will occur during
steady braking.
TOW/HAUL Switch
256 STARTING AND OPERATING