Let me get this straight:
You want a random amount of Tanks on each and every map(!!), but you also want the same amount of Tanks for both teams?
This idea is ridiculous given the small L4D maps. You can't even properly fit 2 tanks onto a map.
You can customize your servers tank experience with these default cvars
PHP Code:
sm_cvar versus_boss_flow_max_intro 0.9
sm_cvar versus_boss_flow_max 0.9
sm_cvar versus_boss_flow_min 0.6
sm_cvar versus_boss_flow_max_finale 0.5
sm_cvar versus_tank_chance_intro "1"
sm_cvar versus_tank_chance_finale "0"
sm_cvar versus_tank_chance "1"
sm_cvar versus_witch_chance_intro "0"
sm_cvar versus_witch_chance_finale "1"
sm_cvar versus_witch_chance "1"
This gets you late-map tanks on maps 1-4
and witches on maps 2-5