FW capacity

You can figure out ways to use less water. My Lance 921 had 36 gal FW, and I could stay a week to 10 days in the desert, taking showers, on 36 gal. I don't use it for drinking water, carry that separate, and use paper plates and utensils, so very little dish washings. Bigger issue is gray water capacity. Let it leak a little if you're in a place where you can, or I carried a 12 gal portable holding tank, just in case. I always have a car trailer, either the buggy in the desert or the race car at the track, so an extra holding tank, or an extra jug or two of water is no big deal. I just got an 1161, and it has 42 gal FW, and I just spent 10 days in the desert with two people and didn't run out of water.

However, if I was starting to look for a camper, I'd want as big FW and holding tanks as possible.