Ah, tank encumbrance, that is something that didn't cross my mind... good stuff. Maybe a tank with 2 rockets will take longer to reload, and can fire a 'spread' of rockets... hm.. or maybe 50% to fire each rocket launcher.... yeah, that would make it more interesting...
maybe different tank sizes, so a small one can do reconaissance and only take up 1 space, and the big ones take up 4, field two blaster launchers maybe....