{TAIL ~ Each side rail portion} has a downwardly extending mid wall between the outer wall and {HEAD ~ the inner wall} for supporting the foot support member 
{ TAIL ~ Each side rail portion } has a downwardly extending mid wall between the outer wall and { HEAD ~ the inner wall } for supporting the foot support member
TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH