The carrier and the vehicle are provided with structures which engage one another as the vehicle is so moved so that {HEAD ~ the vehicle} serves to move {TAIL ~ the carrier} along the ramp 
The carrier and the vehicle are provided with structures which engage one another as the vehicle is so moved so that { HEAD ~ the vehicle } serves to move { TAIL ~ the carrier } along the ramp
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL REL REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH