Discrepancy of 0 to 1 excess items per wagon per item with this setup depending on the cargo you load. For most providers this is precise enough for no locked slots as it loads precise if the request is even and if it is odd the excess 1 item can usually fit in an incomplete stack unless you are loading items with an odd stacksize (in vanilla only stacksize 1 items) in which case you need 1 [virtual-signal=cybersyn-locked-slots] per item.