overhall
Ordinary houses tend to be laid out in a somewhat square or broad-rectangular configuration, and so they usually have one or more access-corridors of just fairly-short duration each. Mobile homes, however, are typically long skinny things with all of da rooms' access-doors arranged in a single line, and so performing an overhall in DAT type of structure would be quite a "lengthy" undertaking!
Get the overhall mug.