A permanent plumbed water filter in storage compartment...im still suprised my new 3685rl is without?
Some prefer a single stage over two stages. I like two.
Some do not want more water connections in the coach and add theirs outside. I prefer behind the utility wall.
Some do not want hassle with the whole-house systems and will use an inline hose-thread style disposable system. I prefer the whole-house system.
Just a lot of options and no one way is right for everyone. That said, Landmark 365 now comes with a single whole-house filter system. This will work for most. But it's not in the storage bay. It's behind the utility wall. And honestly, it's the first thing I removed from my coach. I then installed a system of my own design to suit my own needs.
I suggest you think through what you want and add just what you want and just how and where you want it. Chek out
www.rvwaterfilterstore.com as a resource.