Lets see if I can help, and HEY guys I will get some things wrong
Post 2 & 4 do not know if you actually have a Bat charger because you said there is no 120VAC plug. Post 2 used the side cutter comment to just cut the thing out and start over. Post 4 said post a pic so we can see what you have
Post 2 & 4 on charger. Post 2 uses a Automatic Charge Relay (ACR) and only needs a single bank charger because once the start Bat is fully charged the ACR connects to 2nd Bat and starts charging it
Post 3 seems to be talking about simple charger and not a 3 stage charger. Does mention if you have lots of time a small charger will charge the Bat, but if you need it done faster then it needs to be a bigger one
Post 6 my impression is he doesn't understand why anyone would want a charger
Post 7 leaving a charger on full time is only ok with a quality 3 stage charger
Last comment to what you just posted
Plug a charger in and leaving for the weekend it most cases you don't need a high amp charger, little 10 amp 2 bank will work. If you have a fridge or other thing that only operates on 12V power, then may need a larger one. Look at you max load while at the slip, this will advise how many amps you will need.
In short we need more info of your plan for use and load
I bought a 60 amp 3 bank charger for my cruiser and it was a ProNautic. I would not buy another because there quality control is not like it use to be