Fresh water tank

I have a 50 gallon US tank plastic tank that sits between the 5th wheel and my aux fuel tank. I use a 12 volt pump to move water into the 5er when needed. I also have a 50 gallon collapsible tank I use behind the 5th wheel. The 12 volt pump is used on that also. I have an 8 ft box on the dually. The gray water tanks don't get full faster than without the extra tanks. My old toyhauler carried 100 gallons US of fresh water and I still had extra water carrying capacity. We boondock 95% of the time so the extra water just saves trips to get fresh water. I forgot to add that the plastic tank sits below my tonneau cover.