We'll take this one for example:

https://poctra.com/1980-DODGE-VAN/id-B2necnbvOyE8OwS6/RANCHO-CUCAMONGA-CA/Photos

B11AEAX114719

Using the decoder:
https://www.dodgetalk.com/threads/1978-1980-lt-truck-vin-system.45062/

B= Van
1= 1/2 ton
1= Tradesman/Dodge Van
A= GVW of 6,000-10,000 lbs
E= Engine 318 V-8, 2-valve
A= Year 1980
X= plant code - Missouri Truck

So the 7th digit is the plant code.

J/K = Canadian plants