Gravtanks make up the bulk of a prosperous TL4 world’s armored forces. Private ownership is strictly forbidden on most worlds, but “export models” often can be acquired for transport offworld. Gravtanks have armor heavy enough to ignore all damage from conventional small arms, and can only be harmed by Heavy weapons or properly-placed demolitions charges.
Vehicle Weaponry
Most vehicles larger than a motorcycle or hovercycle can mount some kind of integral weapon. Gravtanks are specialized weapons platforms, and can mount six.
Heavy weapons take up more space than ordinary ranged weapons, and each such system takes up the space of two lesser guns.
Every weapon requires its own gunner, and all mounted weapons use Shoot as the firing skill, though the GM might allow Pilot to be used for a nose-mounted weapon aimed by the operator. Gravtanks are equipped with advanced targeting systems, and all of their weapons can be targeted and fired by one gunner.