Description
Hook the green wire on the outputs up to (all of) the loaders, and set T values to the negative of the train (boat) you want to match, and an output of 1 for each item you want to load onto the boat. I've pre-set some values from JD's episode 12, though it's probably not complete (i think at least some of these boats need steel?), and I don't guarantee that it's correct, even where complete.
Extend by copy/paste of a pair of the T=0 combinators before setting, so it's always easy to extend (free wires).