Compact 1x1 loaders that use electricity. They are able to use separate filters on each belt lane, and can stack items on belts if stack inserters are available.
Can you be a little more specific in the issue you are seeing. Perhaps provide a save game, or video demonstrating the issue. I haven't had any issue loading cargo ships from loaders.
Found the problem. If the harbourwall is at the shipwall the inserter can load/unload but not the loader. But i can build a landtile closer to the ship with landfill. Then it looks like the ship drive over land but the loader work.
I haven't every played with cargo ships, so I'm not really familiar with typical setup. If you have a save file showing how it looks with other loader mods I'd be happy to try and adjust this to be more similar.
