I kind of thought it was an exploit myself.

if we (alliance on my server) can stop the initial charge they are toast and will never get in. I find if I send my team over to the platform area on the west side and announce in raid & general defense chats 5x "horde using tenacity cheat, tanks coming from west side" that alliance seems to recover quite well.

it only works when nobody is expecting them to have vehicles already and nobody is defending the west side, I'm sure someone thinks my 5x chat bubbles are an exploit too.