Ottopilot is right.

If a 135 operator does not have autopilot in lieu of SIC authorization in it's op specs, then it is required by the FAA for IFR ops---Even in a Baron or a 310. Pilots must also be approved to use the autopilot instead of having an SIC.

Second, many insurance companies require two pilots in aircraft like a King Air 200 for 135 ops.

Third, auditors like ARG/US like two pilot crews. Some customers will not fly with a single pilot crew.

Also, a C-525 (citation jet, cj1,2,3 etc.) may be a single pilot airplane, but if the pilot has a CE-525 type, and not a CE-525S type, then he/she needs an SIC.

Perhaps this could be a way to get some time.