I've actually seen a few of these through the years. They were Mobile Home Toters. Looks to be a '53, with that Blue, & silver ID tag. Yes most definitely, at least a 1 1/2 4000 series.

Spanky Hardy
Collector Of Fine Old G.M. COE Trucks & Antique Holmes Wreckers

1948 Chevrolet 5700 COE Holmes HD W35 Wrecker
In the Stovebolt Gallery
More pictures on Photobucket

1950 GMC 250 1-Ton
In the Stovebolt Gallery