I would consider a tune assuming there is one available. It will help with the shifting at the right time even with only a minimal HP gain.
Also, are you using premium? I don’t know if it is recommended for your engine, but many newer engines can make use of the premium. You could switch to premium only in more/steeper hills or more elevation while towing.
The turbo will actually help in the mtns like Montana. Our valley floor is around 3000 ft. The passes are quite a bit higher.
In summary, I’d look to a tune to help with shifting at the right time, use tow/haul, and run Premium if it is a fuel recommended for your engine while towing in more difficult situations.