[GeeTwo]

You should be able to drive the hump as long as you have enough ground clearance and any two-stage gear ratio. The lower you gear (that is, the higher the number opposite the :1), the more capability for acceleration, push, and fine control. The higher you gear, the faster you can go when you reach full speed. Maximum speed for a typical 80% efficient drive train is 18.5 fps * the wheel diameter in inches / gear ratio. To get 10fps (as recommended below) with 4" wheels (whether mecanum or traction) you'd want a target gear ratio of about 7.4:1. With 6" wheels, it's about 11.1, and with 8", about 14.8:1. 10fps is rather slow for most of the FRC games, but with high-speed robots more likely to knock stacks over than build them up, this is certainly a defensible number.