[MrForbes]

Interesting.....so the robot design could include a place to put some 1' x 2' sheets of metal on the very bottom, one could order some pieces of 1' x 2' metal sheets of various materials or thicknesses, and then be able to replace the ramp assembly (or arm assembly) with them as long as the robot is reweighed and reinspected. The ballast itself would be COTS, even though it would look like it was made to fit the robot.