What does a defense robot NEED?

[Garrett.d.w]

I'd hazard to predict that the best defensive bots will:
Weigh 120 pounds.
Have two speed transmissions.
Six or Eight wheel drive.
Good Drivers.
Four cim's on drive (six cims stalling will throw your main breaker, I think)
Run every match.
WON'T GET PENALTIES.
Under 30 in tall (to fit under the pyramid)

Their defensive strategy would either involve the choke points located between the pyramid and the wall (to slow down traffic), or camping under the opponent's pyramid and then running out to hit/ push them around when they try to score. You could also deny a climb this way.