KDSS is a system that adds weight and cost to a vehicle that is already capable on and off road. ( MY Opinion) Supposedly if working will disconnect the swat bar to allow more suspention articulation. Its also on the Landcruiser but I drove one of those and was very disappointed with front seat room vs 4 runner. FJ and old land cruisers, not to mention 90K price tag... Its something else to break and fix on a vehicle Ill likely keep till the meter turns 300k, just like my last three Toyotas... Cheers!