The story
From tackle + house where "tackle" refers to a device for grasping and moving objects, which was used by the porters belonging to the tacklehouse.
Etymology from Wiktionary, CC BY-SA 4.0.
tacklehouse
Today it means: A building located at a port, and the corresponding business operated by one of the major shipping companies, that employs porters to load and unload goods from ships. Full definition →