My 2017 Thor Citation was built on a 2016 Sprinter chassis.
The first 3 digits are "WDA" = W - Germany ; DA - MERCEDES-BENZ TRUCK
11th position is a "9". The VIN decoder says "Plant Information: Ludwigsfelde, Germany".
The first 3 digits of the VIN identifies the country where the VIN was built: 1 = USA, 2 = Canada, J = Japan, K = Korea, etc.
MB trucks with VINS starting with WDx, are all built in Germany, the plant code within that country is the 11th position.
Tom, Kathy & 2 Goldendoodles, Sandy & Lucy
2019 Newmar Ventana LE 3412, Freightliner XCR, Cummins ISB6.7, 2014 Honda CR-V FWD