This truck is a 1928 Kenworth SP-55 custom built for the City of Seattle Street Department. It was used by their shop division and had a wrecker set up mounted on it. Although this truck resembles one of today's dually pickups this KW was rated at 2 tons.
This is the only pick-up that was built in the factory for a customer. The truck included special cab/bed, full length running boards, canvas top and a blue and cream paint job.
Found on http://truquetructruk.tumblr.com/ who is about the most discourteous, unpolite, selective dickhead I've ever seen at only giving credit to every other website he finds trucks on.... he just can't seem to get his shit together when he reposts every cool truck he steal off my site.
thanks to Steve for the background info!
this 1927 and 2 1928 trucks are all Seattle Street Dept and sent to me by Steve!