they are supposed to have anything from 1 to around 10 crew members. - in essence the gunboat is an overpowered, oversized fighter that combines the intuitive manouvering of a fightercraft with the power of a capital warship.
examples:
- the orca is a 1 person GB
- most vanilla GBs are probably up to 10 crew members ( that is also due to being able to conduct more tasks than the orca )
- the BHG bottlenose is a supposed to be a 2 seater ( ww1/2 like - one pilot and front gunner, 1 comm officer and rear gunner )
- the conference is supposed to have 3 bridge officers + 5 crew members
transports:
- they are meant to be as economic as possible - so much about them is automated
- crew on all transports is probably around 3 to 10 max
- a bridge crew of 3 should be the minimum to operate the ship ( pilot, comm officer/navigator, copilot/gunner ) + some ppl to act as a cargo crew and maintenance crew.
examples:
- there is an "enterprise" show thats all about a freighter/transport crew. i find that quite convincing when it comes to the size of a vessel and the crew requirements
freighters:
- they are usually 1 to 2 ppl max. they are space-pick-ups.
- no need for a cargocrew, cause thats done on site by the station/base crews
- no need for repair crews, cause they only travel very short distances.
examples:
- dromedary, clydesdale, humpback, drone only show one pilot. - they look like a small truck without crews quarters.