Turbine recently made a concerted effort to add vaults/AHs in more convenient locations in old zones.

One of the most convenient locations is the Crafting Hall at Thorin's Gate Stable. I use it a lot, and others would also due to its proximity to thorin's housing, as well as the stable.

There is precedent for this since Celondim has a Vault NPC in a non main city location for lvls 5+.