A simple one would be the "Luvliner", a battered old Type-M is converted into a mobile brothel, stocked with 'talent', and flown to a world where such activities are illegal. Provided it says on the right side of the XT line there is nothing the local LEOs can do about it except try to intercept punters enroute (note its the punters who take any risk, not the Luvliner's owners or employees). How dark you want to go IYTU will influnce the talent you use to populate the Luvliner.
I did that one, only it was a Saint-class hospice ship (from the Mongoose
Traders & Gunboats) that had been bought up by a rich, bored Noble. The player characters were the veneer of legitimacy; the owner lured them on board under the pretense that they were going to be travelling to Poor worlds, offering free charity surgery to locals who couldn't so much as afford a simple bandaid.
In the end, they made a lot of Contacts, and the "nurses" were very happy with the medics' assistance once a month, when they'd go in for their six monthly checkups, vaccine and contra booster shots.
I ended up writing the plot in as one of the Patrons in my Medic article for Mongoose's
Signs & Portents.
But I moved away from the idea of it being a Subsidised Merchant. Too predictable. A ship classed as being designed for medical personnel and religious types on pilgrimages ... Customs and the law never suspect those, and they very rarely bother to check.
"Port Authority control here. State your destination, and stand by for an inspection."
"Hi. We're the, er,
Errand of Mercy, and we're taking another lot of patients to the, er, leper colony on Menorb."
"Forget the inspection. Carry on."