modifications for better towing

WOW, I have never read so much misinformation on tunes. Not familiar with tuned gassers but a tuned diesel will tow better, faster, and get better mpg while doing so with out any damage or shortened life IF it's custom tunes and not the canned tunes you get in a programmer. So a chip with custom tunes by a qualified tuner, and there are several is the way to go on a diesel. They is so much left on the table on a diesel that when tuned it makes more power more efficiently so better for the eng and mpg.