I use the Ampd throttle booster by Superchips. It's very similar to the Pedal Commander, but fit my needs and desires a bit better. I also use the Superchips F1 tuner to program my truck between towing, performance, or economy modes. Between the tuner and the throttle booster there is a MAJOR difference from stock settings. I can't imagine driving the truck without either one anymore. The electronic throttle in these new vehicles can really make the pedal feel sluggish.
Here's a link to an example of what I use: