annmariec wrote:
Most likely a combination of full hookups and boondocking. Probably not completely in the middle of nowhere but definitely yes to dry camping here and there. How large of tanks are we talking?
Its a matter of your personal habits and usage. FW you can carry extra for drinking and use the tanks for washing and toilet usage. Then figure each shower will use 1.5 gallons per minute water is running, navy shower you can get by on very little, shampooing and long hair will stretch that time out some. Dishes will use some more.
After being used all that Fresh water hits your grey tank, and thats the limiting one for most people. If you are somewhere you can use an outside shower, or can wash dishes outside, that stretches it greatly.
Black tank will fill based also on usage. I've heard estimates of 1.5 gallons per day per person, cant say how that will work for you.
When looking at the trailers, you'll see that the TT's tend to have smaller tanks. 25-28 gallon black tanks are common. Units with larger tanks are out there but you do have to search a little. Grey tanks can run in similar sizes, but are more easily found in the 50 gallon range.
Manufacturers are always looking at ways to lighten the trailers and smaller tanks are one way they do it. And every pound of water you are carrying also eats into your available cargo weight, so for the TT's that becomes even more noticeable.
A fifth wheel generally will have a larger cargo capacity, and larger tanks giving you a little more breathing room on your water usage.
Either way, if the unit you are looking at was a budget model when built, expect the tanks will be on the low end of the size range.