Vacationers limited in cargo?

[Wrong_Way_Finnagan]

I am relatively new to the server, but started a new character for trading, a freelancer in a serenity transport. When I bought the transport I looked over what was for sale, and saw vacationers were a good profit, so I filled the cargo bay with them and headed for the sale point, and was told by someone while en-route that I was limited by the rules to 600 or so, rather than a full cargo bay.

Now, I have read the rules, but didn't see this one. Where is it?

Also, as a second question, I was killed by a nomad player in PvP in another ship and character (a Zoner), so I left the system empty to explore and map. At some point while afk in cruise I was killed by NPC's (ran into an outcast base) and my ship respawned in the system I was PvP killed in.
The player that killed me was gone, but 2 hours had not passed, so I left the system I was PvP killed in again in that ship and continued mapping, more carefully of course.
My question regarding this is when we are PvP locked out of a system but respawn there due to dying soon after leaving, can we run out of the system a second time, empty of course?

Thanks!