Paul..Here's my theory on this age old quandary....
Back in the day,these trucks were commercial/farm vehicles.
How many times in their life would they be securely locked?
Not many I bet.
It harks back to a time where it was possible to leave your house unlocked,never mind your car/truck etc.
The only time these would probably ever be locked is when they were taken to the sprawling Metropolis of the local town!

I agree with Bill(red58) as well.
1 lock over millions of trucks is a lot of $$$$$$$!
F*rd did it with a 50c rubber breather tube,the difference being, THAT cost lives!

Last edited by jockbolter50; 08/16/2009 7:50 AM.

1950 Chevy Advance Design 3100 in Scotland
In the Stovebolt Gallery
More pix on Flickr.
I've definately got this truck thing in my blood ... my DNA sequence has torque settings
"Of all the small nations of this earth,perhaps only the ancient Greeks surpass the Scots in their contribution to mankind" Winston Churchill.