Well not sure if they can but sounds like they need to AIR DOWN and use the arm in conjuction with any movement if its as they say then they should be able to either crab walk out or just drive out i understand that the arm doesnt have the strenght to pull the vehicle out by itself but they should be able to use that to help push the rover or pull it off the rock underneath it kinda like a backhoe where you would use propulsion and the arm to get you out just my 2 cents