Our robot Phoenix hanging at the 2010 San Diego regional in the QF rounds. The drivers deploy the arm (which sits inside the frame) at the end of the match and hook the 2 rollers between the pole and drive backwards while engaging the rollers to climb to the top.
Arm motor is a CIM with a banebots 192:1 gearbox, and climbing motor are FPs with banebots 256:1 gearboxes turning COTS rollers from McMaster.