[sanddrag]

I'd say it will definitely have trouble with the ramp for the abovementioned reasons. However, you could always add a pneumatically actuated drop down assistance mechanism (wheel, wheels, or roller) to aid in the climbing. You could even power it with something like globe or window motors or fisher price motor(s) and gearbox.

If I had my way, this is what our robot would be like this year. I think omni drive is perfect for this game (crab might be better but it is more complex) But it is not my robot, it is the students' robot, so we will be having a skid steer (tank) drive system.