I agree that the really expensive batteries need more expensive fancy equipment to try to help keep them alive as long as possible.
I don't see that the original poster ever said what kind of batteries he has.
I am assuming he has FLA batteries, but that could be wrong.
I have found that the FLA batteries I use will handle a lot of abuse. I never bother to check that they are charged to 100%, I just know they are charged enough to do the job for me. I don't babysit them. If they fail in 3-5 years, I don't care, they are cheap. I'm road trips for fun, not to think about batteries.
For some people, the electrical system of their camper is an interesting hobby. The more gadgets, the more enjoyment. I get that. Those in that group, you know what you have to do.
And then there is another group, that I am not going to attempt to describe. They should just buy the 12-12 charger.
For me, I just want to have electricity when I want it. I am willing to spend money where it makes sense, but I don't want to waste it, or make things over complicated. So for me and like minded people, a pair of heavy gauge wires is fine.