Ah, yes, yet another silly suggestion from a forum noob.
Have an APC variation of the Medium hulls from each faction. These hull variations can carry between 5 (Cobra and Scorpion based APCs) to 10 (Panther and Retribution APCs), provides better health, but is locked to not be able to carry 'heavy' weapons - APC variations on existing weapons (for instance, APC Cannons sitting between the Light and Medium cannons in terms of power and ROF, as well as all variations on Machine Gun save for the Twin Assault Gun) or an APC 'weapon' that can be mounted on any hull as a systems turret (to preclude Dragon APCs with 10+ 'borgs plus a heavy cannon), but only comes with at best what amounts to a Heavy MG. As a turret, it would provide high health, but not weigh down a vehicle as much as other high-health weapons.