I like having Logistic units for my Wargames Armies. They may not get a lot of use but come in handy for some scenarios. The British Army used a half battalion of Highlanders to guard their baggage train at both Prestonpans and Culloden. The Battle of Clifton was fought as a delaying action to give the Jacobites time to withdraw their artillery and logistic train over the hills.
In most 18th and 19th Century Armies, logistics were organised by commissaries. The post of Commissary-General was normally a civilian or semi-civilian one. However the Jacobite Commissary-General, Colonel Lachlan MacLachlan, was very much a soldier, and died at the end of Culloden, leading his clan in a charge. Here is my model of him. He is a highly converted Strelets Napoleonic British Light Dragoon.