That's close to what I came up with too, but I figure I'll lose a bit in radiused corners and internal baffle material volume.
From our boating experience, we've gone 10 days on 150 gallons. I think 100g is a good place to start but would like the extra to make extended boondocking a reality.
We've been on trips where we had to go into town to either resupply or dump out without being at the end of our trip. We've also been places where it'd be hours to extract ourselves, go find water, then go back to where we were, so in the end we just over packed on water- which takes up much more space in the van, percentage- and capacity-wise. I'd like to avoid those scenarios, and a nice big tank in the frame rails plus another 50 or so in the envelope should take care of that, with plenty of space and GVWR to play with!
From our boating experience, we've gone 10 days on 150 gallons. I think 100g is a good place to start but would like the extra to make extended boondocking a reality.
We've been on trips where we had to go into town to either resupply or dump out without being at the end of our trip. We've also been places where it'd be hours to extract ourselves, go find water, then go back to where we were, so in the end we just over packed on water- which takes up much more space in the van, percentage- and capacity-wise. I'd like to avoid those scenarios, and a nice big tank in the frame rails plus another 50 or so in the envelope should take care of that, with plenty of space and GVWR to play with!