Logging Right Seat Time

I'm a Part 135 pilot and we're starting to get a lot of missions that
are two pilot crews. These are in airplanes that don't require a SIC
as the AutoPilots work, we're not flying over 8 hours and it's not
required by the Type certificate.

I'm a Captain in all the planes but move to the right seat often. When
I'm in the right seat what can I log? From my reading of the FAR's I
can only log Total Time. Is that correct? I can't log PIC as I'm not
the PIC nor sole manipulator of the controls. Can I log landings,
Instrument, X/C, etc..?

If you have a reference I'd appreciate it.

Thanks for the help.

Curt