Can't really help answer your question, but wanted to comment. First, when I clicked on your first link and saw the image, my thought was how small that tank is. Then, reading the details saw it's 110 gallons. My second comment is more general in that it's nice to have it and not need it, rather than to need it and not have it. That being said, there's nothing that says you have carry that tank full on each and every trip; but it's nice if you think you might need that much water. Maybe try an experiment and see how much water you actually do use and need. Then you can buy the correct size and not spend more money than you need to. Finally, would it be possible to fill up with fresh water closer to where you will be camping? That way you won't be hauling hundreds of pounds all those miles. Good luck in your search and hope you can find something that works for you.