[twinmill28]

I tried a programmer for my deuce to help with trailer towing---turns out it ran worlds better on the stock tune with the Premium fuel that was recommended to run with the tune. I boxed up the programmer and returned it.
Once you realize that your truck will do just ok towing and don't expect the world out of it, you'll be better off. Just take it slow and easy, and don't throttle down going thru the mountains and it will do fine. The biggest thing I learned about towing in mountains or very hilly areas was that it tends to run hot, so you have to slow down and keep an eye on all the temps---increased engine temp will also bring up your tranny temp. If you're going to be doing a lot of trailer towing and are concerned with heat, a huge aftermarket tranny cooler is a must.