Really unique looking car. Seems to be a 1950s cab over engine Chevrolet based on reverse image search. A lot of people calling it a Suburban but I think it looks different than photos of Suburbans I've found from that era. Maybe it's been modified, idk.
It's a 1954 Chevy COE 5700, but it looks like those only came in flatbed. Pic makes it look like it's been retrofitted with the back end of a 1954 Chevy 3100 panel van. It's probably Photoshop. The panel van's back end doesn't look long enough to do this. It could have been done irl by someone determined enough to make it happen - but then it wouldn't look like it does in the OP.
My fil is right beside me says it's definitely cab-over panel truck he thinks they made that style(cab-over) '48-56. Sometimes he has trouble remembering things. Not cars though - especially Chevys.
Now that you say this, it does look a lot like the trucks from this era. Most of the photos I've found have flatbeds but you can clearly see the same shape in this photo. I wonder if they sold a panel truck like this or if it was modified to be enclosed.