This vehicle is closely related to the chariot used by the archbishop of Cologne Siegfried II of Westerburg during the fateful battle of Worringen June 5, 1288 against Duke John I of Brabant, the town of Cologne and several other major powers.
According to Jan van Heelu, it was captured by the troops of the town of Cologne, while it served as a fortified chariot during the battle. It had been well preserved in the armoury of Cologne until it was destroyed by French troops several hundred years later.
This battle was one of the biggest and last "classic" battles of the Middle Ages.
I still have to add a proper banner and replace the horses with cows.