Stroker gave you a good suggestion.
Maybe your buddy should send his PCM to DP or PHP and get them to tune his pcm for one 40-60hp tow tune, i believe they are the only two who can burn/tune your stock pcm. I have ran dp and beans tunes, dp was on stock injs and beans was on stage 2s. Dp seemed to have better tow tunes, but i only towed 4k so i didnt really need tow tunes.
It might help if you can say how much your buddy plans to tow(weight wise) and if hes gonna drive it other than towing. I would imagine anyone of the top tuners could give him some good tunes for mpg, towing, fun. just depends on what his plans are.