We have the same system that Jackal1959 has and think it works great. DW is very picky about water but this system produces totally fresh and clean water all day long without any loss in pressure. Got it at
www.rvwaterfilterstore.com who were very helpful putting it together.
Here's a link to the installation I did:
http://home-and-garden.webshots.com/...80095610ovgkmY