To dream of a garbage truck represents decisions or a direction in life that allows you to always not have to notice negativity. A choice or new method of thinking that always spares you of a problem.
Example: A young man dreamed of killing a childhood enemy and sticking his body in the back of . In waking life he was experiencing hair loss due to an illness and feared embarrassment. He had also just purchased a hat to hide his problem. The represent his new hat being a way to always avoid the embarrassment of his hair loss problem.