I started a new map and I was able to cheat myself to some red-science and after researching logistics, I got the loader, thanks.
The remaining issue is that on my "old" (that is, a week or so) sea block map, after removing loader-redux, my loaders got replaced by "yours", but they don't appear in the crafting menu/FNEI etc. But I still have the items in my inventory/on-ground. Got any ideas on why? Would you like the save-game?