Mike:
I have the exact Watts system you are looking at installed in my motorhome. I put it in about 6 Mos.ago and am very pleased with it. There are several things to consider. RO systems do not like hard water as it cuts the membrane life short. I am sitting at my ranch in Nevada and the water is terrible so I installed a water softner in a shed and run the water through it before it reaches my motorhome. This way I have soft water for the motorhome and RO water for drinking and the ice maker. The info that RO systems use about 2 or 3 times more water than they produce is true. This does not create any problems while hooked up to sewer, but is a problem if on your tanks. In talking to Watts about this problem their tech suggested that I run the RO waste water back into the white tank as it is not contaminated in any way and can be used. This keeps from loosing this water when dry camping. It would be necessary to put a valve into the system so you ran your water out into septic when hooked up to city water. I have not done this yet but plan on pursuing this before we go back to full timing. DO NOT WASTE YOUR MONEY on a Permeate pump which supposedly would reduce the water wasted. I tried one and it just does not work in a motorhome and I almost burnt up my water pump. You will have to change to a higher pressure water pump as you need to have at least 40 - 80 lbs at the RO.
The install went really easy and if you want to call me I will tell you what little I know.
Jack H. Davis- 775-315-0280
2002 Bounder 39z
2007 Trailblazer
3 Yrs 8 Mos till we can go back to fulltiming!!