Frank T. BlaneRace:
Frank was born to a family of good means, so he had contact with tanks from a young age in the help of the house, his parents had made it a point he understood the difference between tanks and humans, even if he had a hard time with the concept at first he eventually got it. A tank wasn't even a low class citizen.
His father had made a fortune himself, by seeing opportunities were nobody else saw them and seizing them, Frank did the same for himself if in a less reputable way. Frank had seen the horrible way tanks were treated, and how they seemed to be everywhere so he decided to do something about it... to help himself.
A tank has no material wealth other than what they could manage to steal if they try to escape, however they also hardly ever noticed by their "owners" they treat them like pieces of furniture, they speak secrets in front of them, press codes in front of them, everything.
So what Frank does is negotiate with troubled tanks, he grants them the means to escape their current predicament, what they owe is a favor for him, according to the means at their disposal at the moment, and favors afterwards should they have skills worth using.