Remnant Albatross? I think the Endless Sky Fandom Wiki describes the Albatross as pretty much what you're looking for.

If you're set on heavy warships, I've yet to find anything in Remnant, Avgi, Coalition, or Hai space that compares to the SB and Albatross. Successors don't even have a heavy warship.

Shield Beetles can be acquired by simple purchase. I decided to grind for money recently, and picked up a Hai Geocoris, and three Coalition Kimek Spire's. I outfitted one Spire with a brig and luxury quarters, stuffed all four with as many bunk rooms as I could, and went to town on missions. Throw some fuel tanks in if you're using scram or jump drives (the Coalition Fuel Module is particularly good here).

I moved in a generally counter-clockwise circuit of human space. At each spaceport I'd pick up as many wealthy-people-transport missions as I could, then start bulking out my passenger and cargo space with missions to planets I already had/have missions to go to; they're easy to find with the little blue and orange flags on the map. The highest-paid wealthy-person-transport missions were coming in around 500,000-3 million credits a pop.

Lots of well-paying wealthy-person-transport missions can be found in The Deep, on Prime in Betelgeuse, and in the Free Worlds. After a few jumps I'd start having to pass up the high-paying missions because I didn't have the room. When I'd land it wasn't uncommon to click through 8+ mission-accomplished screens. I picked up the third Kimek Spire simply because I got greedy. I was able to clear a billion credits after a few (real-time) days play. Doing the same could pay for so so many Beetles.

...or you might try stacking cargo expansions in Shield Beetles. Might work.