I haven't a clue if this is the case here, but I've seen a variety of fire departments that have rigs that are funded through different budgets (town money, city money, county money), and those rigs are supposed to first-in to the areas which funded them. Perhaps the "rural" rigs were funded through some local rural co-op money? Just a thought....
Taylor Goodman
Captain - Henrico County (VA) Division of Fire
Fire Chief - Huguenot VFD, Powhatan, VA
Captain - Henrico County (VA) Division of Fire
Fire Chief - Huguenot VFD, Powhatan, VA