There are tuners out there for your truck, they WILL void your warranty, and the dealer WILL know if you have had one on the truck, no matter how it loads or installs. No matter what "THEY" say, the computers in the truck will show if you have had a tuner on there.
That being said, some very nice things can happen when you do some work to your truck. You will get improved mileage, both towing and empty. I am a Cummins fan, but am familiar with some of the Ford stuff, and that new 6.7 is a very nice engine, and some say the best since the old 7.3 Powerstroke.
Before you start making any mods to your truck, you need to answer some questions. Is this your first diesel, or are you familiar with their quirks? Do you plan on keeping it for a very long time, or just a few years? Are you able to do any of the mechanical or electrical work on it yourself, or are you paying someone to do it for you? Is it your only vehicle, or do you use it mainly just for towing and occasional other stuff?
With that I would suggest, as others did, to join a diesel truck forum, join several there are MANY. I belong to several just for Dodge Cummins diesels. There is some great info out there, and I am sure someone has done just what you want, tried it different ways, and has reported his results. The trick is to find the right info that helps you, and that takes HOURS of reading, literally hours and days of research. Granted, you can take it down to the nearest truck performance place and say " Make it better", and they might, just not better for you. Not knocking any shops here, just saying the customer needs to have an idea of what they want, in order to get it from the shop. Read up on what others have done, how it worked for them, and what they thought of it or if they would do it different. Ask questions, but first search the threads. There is a lot of info already asked and answered, so search is your friend. The trickiest part of these forums and all their great amount of info is those who think they know more than they do and will tell this mis-information to anyone who doesn't know better. So be careful with that.
I don't know of any diesel shops in Wisconsin, but go buy the newest issue of Diesel Power and read thru the adds. Call up some shops and start asking what they recommend for your situation and what you want. There are some great shops out there.
I do know that SCT, Spartan, and some others I can't recall sell tuners for your truck. There are a couple places specializing in just Ford diesel performance. I hope you get what you want out of your truck, having a tuner or programmer is great. I enjoy mine, makes it very easy to have more than one tune. I use one for daily driving, one for towing when I don't need max performance, and one for playing with those little imports and mustangs. I get better mileage when empty and while towing, and my truck is even more fun to drive. I have added several mods to go along with the tuner, intake, intake manifold, exhaust, fuel supply and filtration, turbo, clutch, that kind of stuff.
Tow safe, enjoy that new truck and trailer.
2006 Ram 3500 SRW, Not Stock
2014 Dutchmen Voltage 3950 Epic II
LIFE IS WHAT HAPPENS WHILE YOU ARE MAKING PLANS FOR THE FUTURE.