If I wanted to buy a cam to help improve the towing power of my 5.3L what sort of options would I have?

 

I was on Vinci's website last night and noticed a grind for towing/performance. Not sure if anyone's using it and has any input though.
Here's the link: http://www.vincihighperformance.com/...s%20truck.html
They make a tuner with pre-programmed files for their cams also.