I will argue with these naysayers...
I have a 2004 hemi Ram 1500. 300k + miles on the clock.
I tried to tow our 25' trailer from the shop from a warranty job, and it was miserable. It up- and down-shifted like crazy, even on level ground.
So I got onto a dodge forum, and asked around, and was told to talk to Greene Racing, and the guy told me to buy an old used Superchips tuner (from ebay). He said don't mess with the transmission tuning, just run the "tow tune" and it should be fine for what I was wanting.
It was TOTALLY different!!! Positively! Held gears longer, did not shift up and down, and towed the trailer through the hill country without a hitch, and without shifting all up and down like it did before.
So YES!!!! Get the superchips. It really does work.
Check this thread out...
Can I get feedback if you used a performance "chip" while towing with a hemi truck?