modifications for better towing

No point in tuning a gasser. Add a CAI, like S&B, and call it good. Canned tuners are not that great to begin with, and there is not much you can do with a stock gasser and tuning. EFI is available on the GM gassers, Duramax, and 07.5-10 Cummins. Problem is all the GMT900 GMs, 07.5-new record everything flashed in the computer and the toque values. When something major happens, GM requires a snap shot of the computer, and can and will deny claims because of tuning. Doesn't mater if the tuner says its not traceable. I run EFI from Kory Wills and love my tow tune. 60hp at the wheels and turbo brake at 2000+ RPMs. Works great and I have not even towed with it yet. The problem is not the engine, its the trans. Most stock auto trans can handle a little more than stock power and thats it. Add in all the extra weight of the trailer, its even less power it can handle.

Best mods for towing are things like air bags, some lights for backing up at night, maybe a reverse camera, that kinda thing.