Okay totally winging it here.
Collossus clash
16 V 16 on linear layout map tempelate with two massive vehicle on each side three control points to a median line in the middle of the map. At each control point will activate a key ability for your Scarab or Mammoth. Meet in the middle and duke it out hen the other side looses there the monster vehicle it all defensive for the other side till it reaches the other end of the map. Power core on each will be open of attack winning it for the team.