The swing arm assembly is pivotally mounted to a pivot about a swing arm pivot axis located above the bottom rail surface when {HEAD ~ the suspension assembly} is mounted to {TAIL ~ the trailer} 
is mounted to
The swing arm assembly is pivotally mounted to a pivot about a swing arm pivot axis located above the bottom rail surface when { HEAD ~ the suspension assembly } is mounted to { TAIL ~ the trailer }
OTH OTH 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 HEAD REL REL REL TAIL TAIL TAIL TAIL TAIL TAIL