I absolutely loathe fast travel, that's no surprise to anyone who's read any of my posts.
But since we live in a world where it exists, and Knarr's with their docks exist, perhaps it's time for this to exist.
Carriage houses can accommodate up to two wagons and serve as a Knarr Dock for wagons. While out in the world you would be able, at the cost of travel weariness, teleport back to your carriage house.