N – Load is a live load or unload, but not driver assist.
Y – Load is a driver assist.
S – Load is a swap. Must have empty trailer.
P – Load is preloaded. May bring MT or BT
W – Load is available within the time window only. Typically a swap, but not always.
D – Delivery is a drop. there may or may not be an MT available.
B – Bobtail into shipper or out of Consignee.