A retractable cover system for {TAIL ~ a tipper trailer body} of {HEAD ~ a truck}, said retractable cover system comprising: 
A retractable cover system for { TAIL ~ a tipper trailer body } of { HEAD ~ a truck } , said retractable cover system comprising :
OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH