I agree cross country at night in a single engine is a crazy thing to do....
Now that is open to some debate!
I don't fly at night in the Bonanza much, but think nothing about launching into pretty hard core IFR.
I have flown 50,000 nm in the Bo in the last couple of years - what's the chance of it sh*tting itself in the next 500?
If you know the aeroplane, particularly its maintenance and operating history, the single engine debate is mostly psychological.
Dr