..... is recreational vehicles.
Not long ago HGTV did a show on luxury RVs. They are custom made to order, and can cost in excess of $1 million.
However, they didn't say how they disposed of the bodies.
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Snopes is a site that debunks Urban Legends. But this is true; there are people who retire in hotels and cruise ships.
My favorite part: "when you die, they just dump you over the side at no charge."