Those are bargain prices compared to new agricultural tanks. Yes, full they would overload many vehicles. You don't have to haul them full. Haul half full, whatever. For some situations, they could be topped off by shuttling 55 gallon water barrels, also food grade.
If you bought three of them, you could stack one on top of two metal pallet frames, and achieve gravity running water. At a cabin, not boondocking
. that might also reduce wildlife nibbling (?). Maybe a fence around it.
Nice find for the right situation. Great way to store water for a rainy day. Well, you know what I mean.
I suppose they could also be cut on top to create livestock water tanks.