 Although tracks are traditionally considered better for all-terrain mobility, the Marines believe wheeled vehicle technology has advanced enough to enhance survivability and mobility in a 35-ton-class platform; the Marine Personnel Carrier technology demonstrator used "in-line" drive technology that enabled all four wheels on each side to pull together much like the way a track does.This demonstrated ability when combined with a higher ground clearance and central tire inflation system, substantially closes the maneuverability gap for wheeled vehicles and results in equal or better maneuverability than the M1A1 and better performance over the AAV, both of which are tracked.Improved technology used to inform requirements to build ACV 1.2 vehicles will later be applied to delivered 1.1 versions to upgrade them to 1.2 standard.