I am currently trying to see if I can do a really long vigilante misison, like up to Level 200. 
I am using the tank, as it is indestructible, but it keeps eventually flipping onto it's back and I fail. 
Does anyone know a god way to avoid the Rhino Tank flipping over after a while, I sometimes hit a car and when it explodes my tank turns over and I can't get it back. 
Also, which of the 3 Islands is quickest for doing Lots of Levels in 1 Hour?