You happen to have a vehicle that gets the biggest gains of any from a programmer. With superchips you will gain 50hp and 5o lbft of torque(max gain) (on performance tune), you would run the tow tune and still pick up alot of power. Other tuners are good as well, I just happen to have this one. I think this should be your first improvement, you will gain alot. With this you will be in the same power range as the last hemi. With my 4.7 even though it's only rated for 6,500lb towing, I wouldn't hesitate to tow 8000 lb.
Breathing in and out is good enough for me.