{HEAD ~ The flatbed unit} includes {TAIL ~ forward and rear slabs} coupled together for folding movement, and the forward slab is foldably mounted on the tractor 
{ HEAD ~ The flatbed unit } includes { TAIL ~ forward and rear slabs } coupled together for folding movement , and the forward slab is foldably mounted on the tractor
HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH