This thread got me intereztedt in finding out vhat elze dere vas on der zubjecht in der forums archives. (enough Katzenjammer Kidz Deutsch?)
There is a 14 post thread (search under "designations") that has a lot of additional information, and even includes a link to a website that breaks down the mercedes models.
Unfortunately, that website,
http://fly.hiwaay.net/~gbf/mbmodels.html, does not help to demiztify der letter dezignation.
As far as the "T" designation for the station wagen, I always thought it was for "transporter".
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