The verb "toss" connotes a lack of respect or care and a disregard for human life. It implies that the body has no value suggesting that conflict causes the devaluation of human life and a loss of sanctity. Due to the fact that they have been exposed to so much death and violence, they are now desensitised to it. The rhyme of the nouns "body" and "lorry" add some fluidity - suggesting that this action of tossing and disposing of a human body is a routine and they are used to it.