Going for 3 robots on Ramp?

[LafondaOnFire]

I see it being a big risk-big reward part of the game. Sure, we haven't seen any robot balancing yet, but two robots will likely be easier to fit on the ramp, as well as balance on the ramp. Either a team can take the easier feat of balancing with two robots for twenty points, or risk zero or forty points while trying to balance three.
Picking a small robot for the third alliance choice will likely make it easier to fit all the robots on the ramp, but even still, how much room will it be to alter weight? I see some teams that are better at balancing using some mechanism to shift their weight.
Since there is no specific time to begin balancing the ramp, I bet some teams will start maybe at 45 seconds remaining so they may ensure those forty points.