Ok, gotta stand up for the Chevy/GM guys. I have a Silverado 2500HD Duramax crewcab. The towing capacity is awsome! The six speed allison is a fantastic tranny. Pulling my boat the thing doesnt even come out of 6th on most hills. With my 5th wheel it may drop to 5th overdrive but only goes down to 4th on longer steep passes. I am not a big dodge fan although I think the cummins is a good motor, just dont care for the rest of the truck. I like Fords ok too but their 6.0 diesel was a FLOP!! Time will tell on the new ford motor. Toyota builds nice truck but they only go 1/2 ton which pretty much leaves them out of the larger trailer/5th wheel market. I have owned toyota cars before and have been please with them. It all depends on you needs. As for me, I love my duramax.
Bret