Rank: Foederati
A good trade route is Dvorsi to Aymifa
You buy resonating separators at Chernkyh ring in Dvorsi system (30ls)
Then travel to Aymifa Lomonosov colony (600ls) sell the resonating separators and buy gold, then travel to Dvorsi to sell the gold, and rinse and repeat 😛
This route gets 2300 per unit per trip