Each team starts with 1 Manta, 1 Scorpion, 1 Hellbender, and 1 Paladin. If you have 5 or more people on your team, each of these vehicles should be taken from the core at the start of the match, though I don't really care for the Paladin. 

The Manta can be used to quickly get in front of the opposing team's orb runner & squash him, to hide inside of the Enemy Prime Node before it is built preventing it from being built, or to establish a defense at Center Node.