What's the difference. I went back and forth between Timbrens and Airbags and settled on these. I'm glad I did. 2006 F350 6.0 ccsb towing a 42ft five with 15000lbs and 2400lbs finger weight = perfect setup with them. It was good before, but great afterwards. The guys who are trying to convince me to buy airbags are now buying tones.