For a live aboard going absorb for 12 hours (essentially infinity) works well, and is highly suggested. When you store the vehicle or park it in the sun with no consumers/loads, turn your absorb down to a couple hours.
If you are not likely to spend much time plugged in, a charger with 3 stage profile is best. That being said, if you have a decent solar array, a simple PSU/float style charger/converter can work fine.
Here is another option. While I was in NZ they had the cloudiest may on record, something like 15 hours of sun in ChristChurch. I simply could not get enough solar, and there wasn't much driving for charging either. I did not have a 220V charger, and all the local places wanted something like 400$USD for anything more than 5A.
So I went to the computer repair shop, and got 2 90W laptop power bricks. They are all universal voltage, and output around 19V. I wired them in series (you could do parallel), and connected them to the solar input on my MPPT controller. Plugged it into the wall, and instant 13A 3 stage charger.
On some MPPT controllers you will need to adjust the array voltage sweep, becuase the laptop bricks will fault out if the current gets to high. So test it beforehand.