Need help IDing this old truck I found

Ok, the only identifying marks are on the bottom (P1718) that's it, nothing else. Wheels turn and the tail gate opens. Missing 1 headlamp and drivers rear view mirror needs reattached. Can someone help me ID this beauty?
Got it in a Storage shed auction. It had some other nice item, but this piece has got me baffled because I'm usually very good at identification. I have several more pics if you want please let me know and I'll send them to yo