The first thing that I would do is open up the exhaust by getting rid of the stock down pipe along with a open air air intake such as the Tymar or a DIY one. The next thing for me would be to get a custom burnt chip instead of the Edge. For some reason a custom burnt one just does better in my opinion. Then check out your gearing, the OBS trucks came with either 3:55's which are bad for towing or 4:10 which are better for towing, also if you have taller tires that will hurt your towing capabilities.