Absolutely love the engine breaking on both of my 3.5 ecos...put er in tow/haul and let er go that's what it is for...forget manual shifting that's what the tow haul is for if I wanted to manual shift anything I would purchase a truck that had a clutch...who cares if she's revving at 5k RPM she can do that all day long...after 50k towing on my 11 and 20k towing now on my 18 I have never ever even thought about using the manual shift while towing the only time I have used that was in severe snow conditions not towing. But this is my opinion and my 2 cents...