I just bought a 2006 Fleetwood Niagara from a local dealer here in Mesa, AZ. I was told this is one of the top of the line models. I was looking at a 2007 but they had a 2006 on the lot that was only slightly used. Long story short I took it out for the first time this weekend down to Wilcox, AZ. The first time I used the sink the water backed up. I couldnt figure out what the problem was. After looking around come to find out that the trailer does not have a gray water holding tank. The water had backed up. It has a fresh tank and black tank. Thats it. I was told when I bought it that the 2006 and 2007 models were exactly the same except for the color schemes. The salesman reviewed with me that it had a 20 gal fresh, 6 gal water heater, and 20 gal gray tank. When I go onto fleetwoods website it shows a 20 gal gray tank as a standard feature. This is the first trailer I have ever bought. Can anyone shed some light as maybe why this trailer does not have the tank? Sorry for the long post, just really frustrated to find out I dont have a holding tank while in the middle of camping.