Great thread - Thanks for starting it - I am in the similar situation, I have a TC650 and had it on an F150 with air bags. The F150 worked but it was overwhelmed at times.
Now I am looking at a Ram 2500, 5.7 Hemi, Crew Cab, 4*4, probably leather. One thing I noticed when testing a few 2500s (and having put a lot of miles on a variety of other vehicles) is the ones that did not have electric adjusting seats were out of the question for me. To be able to move the seat up and down depending on the terrain (interstate vs backroad) I will "always" adjust the seat to reflect the driving position I prefer for each circumstance.
I don't have any experience/knowledge with the adjustable foot pedal feature on these trucks, but figure that would be icing on the cake to have this feature as well.
Good luck with the search cninghm.