RO units waste water, which I can't afford to do in CA. About the best RO there is wastes around a gallon per gallon yielded. I'm considering going to an ultra low waste regenerated ion exchange system for our home to get pristine low TDS readings from our well water for drinking and the ice maker. However, both RO systems and regenerated ion exchange systems should have sterilized water coming into them - whether it be accomplished via UV light or chemicals. One of the under-sink ion exchange systems might be great for RV use too, depending upon their electrical power requirements in small form factors.
Ozone systems, sealed or otherwise, do not produce enough free chlorine to make iron into what I need it to be. Around 2.5 oz. per 1000 gallons of store-bought Chlorox works has worked for us for years. For our RV, I use about 6 oz. of Chlorox per each 40 gallon fill into the onboard tank. For our well situation, straight chlorine dioxide would be better, if I could conveniently and inexpensively get it. Next year some time I'm considering sterilizing the well with Sterilene, which is around 200 times more effective than standard chlorine.
P.S. #1: We're ultra careful with what we or the dog drink. Swelled hands and high vet bills are in the same category .... verboten.
P.S. #2: This outstanding hose would be excellent for RV use - rated for potable water, ultra rugged, and just about the world's lightest and most compact to store (not counting the rollup-on-a-real hoses) for RV use. We use one on our deck and it's the best ever for older hands with arthritis. 1/2 inch, I.D., hoses are all that's needed for 95% of home/RV applications and I finally got fed up with lugging the common hardware store 5/8 and 3/4 inch hoses around:
http://www.waterrightinc.com/