Despite the use of thinner——armour, the operational weight was still and the speed only . The tank could also carry supplies in a tray on the roof behind the commander's armoured observation turret (being the highest point at ), while towing up to three loaded sledges. Rackham tried to improve internal conditions by putting a large silencer on the roof together with ventilation fans; but there was still no separate engine compartment and it is, therefore, questionable whether the project achieved the goal of a vehicle capable of delivering a squad of infantry in fighting condition, even given the severely limited operational range of the Mark IX.