corvettekent wrote:
I think that you need to look at this another way. You did not say how many people will be staying in your RV for one week, so I will use my 5th wheel as an example. I have a 45 gallon black tank and it takes two of us 20 days to fill it. That's 1.125 gallons per person per day. So, after one week of camping, we would only have 15.75 gallons in our black tank.
After a w0eekend of regular usage, our tanks get about 1/4-1/2 full. Our largest tank is 38 gallons. So, I want to be able to dump it as needed and not have to not use the facilities we have.