I have 2 others of the Matchbox model. The Matchbox and Hot Wheels trucks are pretty damn hard to come by. I seriously lucked out on both the Hot Wheels Edelbrock truck and the gold one, which is a Wal-Mart Valentine's Day exclusive. I just happened to find a pair of the Edelbrock trucks hanging on the pegs one day. When I found the Valentine's trucks, I found one hanging on the pegs in the Hot Wheels aisle and was wishing I would find another one. I was walking through the Housewares area with my wife and just happened to see one sitting on an end cap that someone decided they didn't want. Lucky score. The black Hot Wheels Racing truck is also a Wal-Mart exclusive.
Here's a page that shows all the current variations of the Hot Wheels truck:
http://hotwheels.wikia.com/wiki/'83_Chevy_Silverado
I still see the gold Maisto wrecker set quite a bit and the blue one every now and then.