Hi All.
Pretty simple question to answer. Once hyou have had "Soft water", you'll never like going back to "Hard Water " Again, Period.
Many years ago I installed Water Systems (Systems, not just Water Softner's. I made up my own Water Softners in an RV So for many mnay year I have hook-up Water 'Softners' way before they ever though of making anything small enough to even fit into an RV, and not even mention the weight of them, way bacK then.
If they are good enough for a "Stick & Brick House, then why not an RV. They sure do save on the plumbing.
Good Luck. Happy Travels. Dan & Jill & our two small "Yorkie Kids", who love to trave as much as we do.