This was inspired by a Gadget Boy cartoon, But I thought it made too much sense to ignore.
SMART GRAPPLE
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You have this lightweight robot, which can look like a frisbee. Through it over an obstacle. The CPU in the center activates, the edges spread out to be legs, and the eyestalk comes out. It looks around for a secure grip, walks over to it, grabs, and tugs on the rope behind it.
I had a few different prices, depending on drive (none, air cushion, grav).