If you really think about it, the conversion makes some sense.
Caddy hearses could be had pretty cheap, but still have a lot of good use left in them. They are usually well maintained and always clean. The frames and suspension on them are pretty beefy and should handle the load OK. It's going to ride and drive better than a converted pickup, because it's a Cadillac.
Laugh at it now, but it probably had some good times had in it. Not a restoration project for the faint of heart, but it would be cool to see it saved.