Ship carrier service levels 8.03.400

Has anyone come up with a way to structure both carrier and service
level, ie UPS Next Day Air or UPS Second Day Air or UPS Ground, in the
ShipVia code? I had hoped to use SCACs but for the package carriers
like UPS and FedEx there are too many service options available. And a
4-character SCAC just fits into the 4-character ShipVia. Even LTL
carriers have multiple service level options.
Your sharing your experience would be appreciated.