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*Phoenix /Marauders/ are currently (v4.00b2) the /only/ FIGHT ship with a cargo bay (albeit small), and can only be gained for player use by capping. If you can cap 1 or 2 they make excellent traders within the TO system, as once you've regained the relevant rep no other PM will attack yours! . They will occasionally be Fight mission targets or can of course be captured from UA or CAR (as long as you have or regaining blue reputation, their PMs won't attack Otani's!). My current recommendation is to set a Nav Beacon (available from Equipment Dealers) in an Empty Space sector /south/ of Verdant Profit & use Transfer Wares to offload the PM's cargo to a standard freighter, as the PM being a FIGHT ship, will otherwise be subject to any hostile factions (eg PMC) once through the gate into Albion. The trader, however, will be relatively safe if it only flies to the Empty Space sector for transfer, then back or on again to wherever it wants to trade
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