Once positioned adjacent the boat, {TAIL ~ the mobile boat supports} are anchored to the deck and {HEAD ~ a boat support structure} is extended from the mobile boat supports to engage and support the boat 
Once positioned adjacent the boat , { TAIL ~ the mobile boat supports } are anchored to the deck and { HEAD ~ a boat support structure } is extended from the mobile boat supports to engage and support the boat
OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH