Back in 1997, I was able to buy a Fleetwood Bounder with a standard 100 gallon fresh water tank! Then in 2002 and later they started having Cargo Carrying Capacity ratings, so they have a CCC after all the tanks are full. (Fuel, propane, fresh water, and water heater).
So manufactures have learned for a better and higher CCC, they can install a 50 gallon and smaller tank, then have a higher CCC by 100 pounds or so!
You can fill all the 5 gallon tanks when you arrive and then not need to walk back and forth to the fresh water. However you probably also have a 50 gallon grey water tank, not one large enough to handle 75 gallons of fresh water.
I used a siphon to refill my fresh water tank - yes I could spend 3 weeks in one spot, and take daily showers, so I would pick up water while out sightseeing. I could hang the 5 gallon tank from my ladder, the fresh water fill was near it. Or put it on my bike rack.
Some ways to conserve fresh water - I had a tub, so collecting 2 gallons after a shower was easy, and I could use a dishpan to refill a 1 gallon jug, then use that to flush. Or put some of the water into the black water tank (mine is 52 gallons for some reason).
You can use a dishpan while doing dishes, and most campgrounds can accept a small amount of water on the grass, but not if the place is to crowded.
I have not used a blue 'tote tank' in the 20+ years of camping. I would rather just go to the dump station and dump both tanks at once, and refill with water then.
At one campground, I bought 6 each 50' drinking water hoses. These allowed us to hook up to a distant fresh water line. My neighbor also filled his fresh water tank at the same time.
For full time use, I was thinking of either putting a 35 gallon fresh water tank into the truck I pulled the fifth wheel with, or install a 20 gallon tank into the back of the car that we might tow. Either way, a 12 volt pump powered by the car battery would fill the RV tank.
Tank-Depot.comHave fun camping!
Fred.