[Tom I]

That idea could work, but I think you'll find it'll be difficult with bumpers. My team actually has an arm, about 1.5' long, with a small wheel at the end. It's slow moving but it has enough torque to push the ramp down to the floor (alternatively raise it up to lower the other side for an alliance partner). It also doubles as a way to lift our frame up and over the barrier.

Main take-away: I'd suggest doing as much as possible with active control as opposed to passive control.