Master of air tank busting Hans-Ulrich Rudel had his own tactic of assaults. He fly behind enemy lines,and attack armor from rear,when it is thinner ,and in case to shoot him down,he can eject on frendly ground not on enemy. Heavy tanks had purpose ,but as much they can do,they was more then that limited ,usualy with under power, freq. breakdowns,off road mobility ( actualy T1 had great mobility considering his weight,same as panther,tnx to his excelent suspensions and gearbox) transport limites,fuel consumption,etc,etc,etc. There is know for one case when Soviet KV-2 blocked whole german division for whole day ,and they could not destroy it with nothing available then (1941.) eaven with multiple direct hit,but they did disable it by hitting the track. Crew was shoot till they had ammo,later they bailed out.