Go here to find optimal trade routes: https://eddb.io/ If you find really good ones, post them below.
At the time of this posting... Nearly 20,000 profit/unit round trip, can accommodate large ships, and relatively short jump distance: https://eddb.io/trade/loop/236868084 With a Type 9, you can easily break 15 million per round trip in very short time. You will be carrying some valuable cargo though (Silver), so be extra careful about being intercepted. Carrying a fighter to deploy and distract pursuers is recommended.
