...
string markerPrefab = "assets/prefabs/deployable/vendingmachine/vending_mapmarker.prefab";
...
BaseEntity ent = GameManager.server.CreateEntity(markerPrefab, Base.transform.position);
pitmarker = ent.GetComponent<VendingMachineMapMarker>();
pitmarker.markerShopName = "string";
pitmarker.Spawn();

Title. Also, possible to use another mapmarker icon? I tried to simply replace the prefab with assets/prefabs/tools/map/cratemarker.prefab but doesn't seem to work. 

public ProtoBuf.VendingMachine.SellOrderContainer client_sellOrders;