I believe the most unique feature of our (1824) robot is the hinge point for our ramp/platform. We hinged at the bottom of our robot, 3/4" off the ground. We then used 3/4" steel box tubing from the hinge point. This allowed the entire structure for our ramp/platform to be supported by the carpet (not just the ends). It can be seen
here.
No chance for our ramp to buckle or get pushed around.