Hi all. I am looking for a long-range trawler and notice that many
converted fishing boats and other interesting (for me) ships have just one
engine. Many of the two-engine ships are semi-displacement ships. I
don't like those much. I just want two engines for when I'm in the middle of
the ocean. So there my question. Given that there is plenty of space in the
engine room, are there systems that would allow me to to fit a second engine
and switch between the two engines WITH EASE?

What I would actually like best (and what would be cheapest I suppose) is to
have to half power engines driving the single prop at the same time but I
suppose any system that would allow me to do that would be quite expensive.
I know it can be done though, since e.g. on the Denmark to Iceland ferry I
was told they use 4 engines to drive 2 props and selectively add or take off
engines based on power requirements (or engine failures I suppose)

So.... anyone?

Thanks