Welcome to the forum. I've used a stand alone unit from Camping World for years and been happy with it... although it is a bit of a pain.
For an integrated system, check out the link provided, and maybe even do some research on reverse osmosis systems. There's been quite a bit posted on them here. There are some really cool RO systems out there that folks have integrated into their coaches.
We've spent a lot of time in the desert SW and some kind of softener is a must.
Best of luck.
Rick, Nancy, Peanut & Lola our Westie Dogs & Bailey the Sheltie.
2007 Itasca Ellipse 40FD