Bannson Raiders is the way to go. If you have several salvage mechs then you can just keep repairing your mechs and vehichles until the enemy is dead. One salvage mech for vehichles and one for mechs. If you do go bannson, the zeus is the best I've encountered... long range and high damage. But if you go with liao, you can use bannson due to their grand alliance with bannson raiders. So use bannson and unleash the horde!!!