Another commenter referenced a programmable roomba from iRobot - see above. I agree that might be ideal. The RVR might not be stable enough to haul around a tab

Another commenter referenced a programmable roomba from iRobot - see above. I agree that might be ideal. The RVR might not be stable enough to haul around a tablet sitting atop what amounts to a big lever, but a camera mounted (low) on an RVR could be a lot of fun.