Yea a tank the size of a building is still a tank tho, the octuptra droid tank was something like 3-5 stories tall, in the movie release of the initial clone wars tv sho ani takes out 2 quite quickly. In ESB luke takes out an AT AT with a lightsaber and a large explosive charge Some of the scarabs are much larger yes but same principals apply: A squad of phase 3 dark troopers with their superior mobility and starfighter cannons could take one out