I agree. I totally see a role for player controlled 2k and 6k cargo vessels (even if they can't dock inside stations --at space elevators instead perhaps?). They would be slower to manoeuvre and no good for dogfighting (perhaps have no weapons at all except automatic turrets and really phat shields and armour) and would need to wing up with other players in agile fighters to traverse the rougher parts of space. But they could be good for bulk trading runs or be the centre of a mining operation with three mining players dropping their ore in the big ship for refining and carrying back to the station.
If it's the size of a Battlecruiser, then no shields. Even a Farragut doesn't have them.