In the olden times of perhaps yesterday....

We used to talk about "ENG" (yes, electronic news gathering) vs. "EFP" (electronic field production).

An ENG truck wouldn't have much beyond a bucket of batteries because ENG meant: 1 camera, 1 light, 1 tripod, 1 mic, perhaps a utility person/driver, a shooter (aka. News Photographer), perhaps a producer, and a talent (reporter, that is) shooting stories for the evening news.

Times do change, and an ENG truck these days in a larger market is likely to have a microwave mast sticking out the top for live remote feeds and now maybe 3 lights and a couple wireless mics, certainly a utility person, otherwise the same.

EFP is what a station would put out on location for commercial and program production, multiple lighting and audio systems, perhaps a better tape format and a better camera, larger crews, etc.

Then there are the larger trucks with switchers, multiple cameras, an engineer to shade the cameras, an audio board, cool interior lighting... a little production control room on wheels, used for live switching of events with microwave or satellite uplink.