2003 Dodge 2500 Hemi towing improvement advice

I don't own a Hemi nor have I ever, but I have to wonder if your truck is running properly if it is struggling that much with 5500lb behind it.

Other members here tow much more than 5500lb with Hemis and I don't recall reading too many posts regarding unsatisfactory performance.

Do you track your mileage? I have to wonder if there's something (clogged cat or fuel filter, overdue for a tune-up) holding your truck back from its full performance.

I track my MPG mainly to watch for a sudden drop in economy which would indicate a component not operating efficiently.

I politely disagree with Slated4; I've been there, done that with intakes, exhausts, chips, tuners, etc. and in my experience they make very little difference and can actually have negative effects (voided warranties, dirty intakes, loss of low-end torque, additional engine noise, etc)

Is your foot to the floor while you are on these hills.

AFE intake, Magnaflow Exhaust, and see what that does for you. If it isn't enough go with a tuner of choice. An engine is an air pump so the more you get in and out the better it will run.

And if that still doesn't get you up the hilss like you want to go then add a procharger! :D

No diesel no significant solution.