Muffy could tell you more than I could about this truck as it was her dad's truck. Uncledusty of course could tell the most about it but he might not tell everything
Dusty rigged it with a snowplow in... oh I would have to guess the later 80's but he'd know for sure. I'm sure the blinking light on the cab roof probably went on in those later 80's or maybe in the 90's.
