I just had the Firestone Air Bags installed on my 2013 Ecobeast, I also had the onboard compressor installed. I have the 6.5 ft bed with the 3/73 rear end and my little 23 ft travel trailer was squatting the truck way more than I liked. I have not towed with it as yet, so I was wondering if anyone else has tried this set up, and how it worked for them. I don't know if it makes any difference, but I also had the front end raised approx. 2 inches to level the truck up. I also need to re-aim the headlights as they are not correct now.