I have a 2007 Commander Hemi and tow a 26ft travel trailer. I have no sway issues at all but I will say I'm disappointed with fuel economy and power. I get between 8-9mpg trying to do 65mph. I say trying because the Jeep really doesn't hold speed well. I had a tahoe before this and even with 200k miles on it i got 11-13mpg and held 65-70 no problem. I figured with a jeeps bigger motor and more horse power/ torque I'd be doing better but sadly I'm not. Now I do use tow/haul mode but I always leave it in 5th gear setting. With my tahoe I would do the same but would leave it in the D setting in that truck. Should I be running in 4th gear? That would give me higher rpms and probably would make it hold the speed better but would I loose fuel economy?
From the 2007 Owner's Manual:
Towing Tips — Automatic Transmission
The “D” range can be selected when towing. However, if
frequent shifting occurs while in this range, the ”Tow/
Haul” mode (if equipped) or a lower gear range should
be selected.
NOTE: Using the ”Tow/Haul” mode (if equipped) or a
lower gear range while operating the vehicle under
heavy operating conditions will improve performance
and extend transmission life by reducing excessive shifting
and heat build up. This action will also provide better
engine braking.
The automatic transmission fluid and filter should be
changed if you REGULARLY tow a trailer for more than
45 minutes of continuous operation. Refer to “Maintenance
Schedule B” in Section 8 of this manual for
transmission fluid change intervals.
NOTE: Check the automatic transmission fluid level
before towing.
Towing Tips — Electronic Speed Control (If
Equipped)
− Don’t use in hilly terrain or with heavy loads.
− When using the speed control, if you experience speed
drops greater than 10 mph (16 km/h), disengage until
you can get back to cruising speed.
− Use speed control in flat terrain and with light loads to
maximize fuel efficiency.
Towing Tips — Cooling System
To reduce potential for engine and transmission overheating,
take the following actions:
− City Driving
When stopped for short periods of time, put transmission
in neutral and increase engine idle speed.
− Highway Driving
Reduce speed.
− Air Conditioning
Turn off temporarily.
− refer to Cooling System Operating information in the
Maintenance section of this manual for more information.