If you are standing near a waterway with a pump in hand, green boxes will appear at valid loading spots. They are in non-intuitive places and overlap the ship itself because the base game is only designed for normal-sized fluid wagons.
I am putting the pumps down, and they keep switching from the vanilla sprites to the modded ones, so i must be doing it correctly, issue is they still dont connect. The pumps do the animation and get on top of the ship, but the sprites dont line up and the pump's arms are not attached to the nozzle of the tank on the ship, therefore nothing gets pumped.