Who makes a good programmer to help out my 2009 2500 hemi. I think it has a ton of power, but I would like it to hold the gears a little longer before down shifting when I am towing my 8,000 lb camper. Oh and of course a little better mpg is always good. I will be running normal octane, so I don't care about tunes that require 90+ octane because I won't run them.

Thanks