Marty,
In the book The Plymouth and DeSoto Story by Don Butler, he states:  "Unlike the 1935 2 door sedan commercial version with rear-end door and removable
rear seat, the new Commercial Sedan body was especially developed for the purpose.  It utilized front doors of the 5 passenger 4 door sedan dimension and
devoted the entire space behind the driver's seat to commercial use.  The spare wheel in fender well was standard for this model.  3,527 of these vehicles were
built, and they were priced at $605.  The 113 inch P-1 Business chassis served the purpose...."

Hi Marty you may be able to find something on allpar.com, I have compiled a register which only lists what I could find on an old club rosta. https://www.plymouthowners.club/talk/index.php?topic=3890.0 . If you are a member of the club you can try the Commercial Car tech advisor[. Hope this helps.

Tom

Greetings, I've come across a 1936 Sedan Delivery. Is there any info available on this model?
Thank you.
-Marty