http://www.lexusofpeoria.com/ 866-604-6439 Significant upgrades to the suspension and full-time four-wheel-drive system improve ride and performance. A Four-Wheel Electro-Hydraulic Suspension with Active Height Control (AHC) and Adaptive Variable Suspension is quicker and allows for a greater range of adjustment than the system it replaces. The new cross-linked system allows each wheel to react to the driving surface it is in contact with and also react to the actions of the opposing wheels.