Lots of different "tanks", some water and some propane. My read is thus:
Quote:
Water: pressure tank is "120g" but has approx 45g of water available. . . plans so far are to add a second pressure tank of equal size, and a 2000g above ground water tank.

Propane: Our tank is 250g, and I have 2 100lb (33g) and 2 30lb(13g) tanks full too.

Diesel:
plan to add a diesel generator (We have a 6500watt (max) gas one already)


Bigger propane tanks are available as are propane kits for generators. Get the diesel genset and a large tank for fuel, but keep the gas generator you have now and convert it to run on propane (back-up for the diesel). Get a bigger propane tank.

Other than fuel, look at what you regularly eat and buy more of that. You didn't mention TP, get lots of TP.
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