I learned a lot from 'The Walking Dead' and it's pretty factual since it's on AMC. So, I'd find a way to take as many with me as possible. I'd never want to be trapped in a tank in the middle of a street with a bunch of zombies (or cannibals in this case) outside wanting to eat my innards.
I wouldn't mind being inside a tank with zombies outside. Since I was a tanker I know how to drive and shoot them (even got to drive a Chinese T55 once). Zombies would not be able to get in with all the hatches closed and they would make good 'track grease'.