I don't think a 10kTon ship w/ 6kTon cargo is really in the same class as the immense bulk carriers I recall from MT.
I certainly would NOT call it that.
But, I think that it could qualify as a 'massive' commercial vessel.
I also would have reservations about whether or not a commercial vessel this large would really be required.
But, if it was, I don't think there'd be much need for an armed version as I would doubt that it would be needed to service anything other than established hi-pop worlds. I'd also dispense w/ the fuel scoops & purification plant.
IMO, though, there would be more demand for passenger space & so I'd swap reduce cargo space accordingly & also have J2 & J3 versions.
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On Sun, 8/24/14, Ian Whitchurch <xxxxxx@gmail.com> wrote:

 Subject: Re: [TML] expected ship traffic
 To: xxxxxx@simplelists.com
 Date: Sunday, August 24, 2014, 8:32 PM

 One reason
 massive military starships exist in Classis Trav is because
 size is an important defense in High Guard, because of the
 "automatic criticals is size smaller than weapon
 factor" rule.

 Lets take, for example, this
 commercial starship
 Ship: Jacques
 CoeurClass: ConsignerType: Cargo
 HaulerArchitect: Iniigi TalanakaTech
 Level: 11

 USP       
  AK-K521243-070000-80007-0 MCr 4,220.919 10
 KTonsBat Bear                 5      
  1     1   Crew: 66Bat              
           5        1     1   TL: 11

 Cargo: 6,045 Passengers: 12
 Low: 30 Emergency Low: 80 Fuel: 2,200 EP: 200 Agility: 1
 Shipboard Security Detail: 10Craft: 1 x 50T
 NoneFuel Treatment: Fuel Scoops and On Board Fuel
 Purification
 Backups: 1 x Model/4 Computer
 Architects Fee: MCr 42.209   Cost
 in Quantity: MCr 3,376.735
 It'll shrug off a lot of laser
 fire. On the other hand, it's fac 8 missile bay will
 break a small pirate in half - and thats only allocating
 about 1% of ship volume to defense, the equivalents of 2
 turrets on a 200 dton ship.

 This ship is more-or-less
 self-escorting, and still comes in at 60% cargo by volume at
 jump-2, and has 1 crewman per 100 dtons of cargo ... while
 built at TL11.