I submit that the Lakon 6 is probably the best VFM trader in the game. People get $$ signs in their eyes when they look at the cargo cap of the Lakon 7 & 9, but I'd urge caution.
I have a Cobra kitted out as a fighter and keep an L6 as a trader with 104T cargo cap (I know it can go to 112T but I'm not sacrificing shields!).
My cargo-upgraded L6 is worth about 1.3+ mCr, and good trips profit average ±60-80k on a good day, and ±100-120k on a very good day. Over 150k per trip is rare.
The L7 holds 224T maxed but keeping shields and base model cost 17.3m, i.e., excluding cargo upgrades. So, ±17x the price of an L6, with a tad more than 2x the cargo cap. Thus, to earn enough to buy the L7, your L6 has to do about 200 trips @ ±80kCr/trip just to get your bank balance bank to where it was (possibly zero) plus an shiny new but empty L7 and maybe no money to buy cargo to sell. To be sure, once you can afford to buy 224T of high profit cargo, you will be making money faster than in your L6 - twice as fast, so it will take you another ±100 trips @ ±172kCr/trip to get you back to your pre-L7 bank balance.
The L9 is even worse, and I'll leave the sums an exercise to the reader (if any are still here!).
Caveat emptor.
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I've been idly considering this. Are you guaranteed that the destination starport will always buy your rares?