Expedite uses trucks, but that's where the similarities between Expediting and General Trucking ends. It's the same with FedEx Ground and FedEx Custom Critical, after the "FedEx", all similarities end.
FedEx Ground, and general trucking, is like working at McDonald's where you work every day, all day long, and are constantly working, for no money, and you don't have a choice in what you are doing. Expedite is Catering, where you may do nothing for days between jobs, and you have no idea what or where the next job will be, but you can pick and choose what you do and the pay is more inconsistent but better.
If you run for Ground you're a slave. If you're an expediter, you're a picky and choosy persnickety slave with an attitude.