{HEAD ~ The apparatus} may be advantageously mounted on {TAIL ~ a trailer}, for towing from site to site 
advantageously mounted on
{ HEAD ~ The apparatus } may be advantageously mounted on { TAIL ~ a trailer } , for towing from site to site
HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH REL REL REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH