A majority of my work these days is on documentary and news magazines shows like 60 minutes.
Primary audio is almost always taken from the camera (usually Sony F5, F55, Cannon C300, VariCam).
For sit down interviews I'm always hardwired to the cameras (usually 3 to 4 cameras per interview). When we aren't tied down I'm using a Zaxcom hop. Which consists of the wideband camera link transmitter and several RX200 receivers - 1 per camera. The rx200 will output 2 channels of audio and time code on a single carrier. The rx200 is small lightweight and will run all day on a set of lithium AA batteries.
I also always record a backup of the camera feed in the camera link. The backup recording is primarily used for transcription - I will use zaxconvert to convert the files to mp3 - but they can also be converted to BWAV files if needed.