xkcd #3298: Aerospace Flowchart
Title text:
Someday, we will find the problem that goes with this solution.
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Source: https://xkcd.com/3298/
Then you would need a heavier structure to be able to support twenty tons in total, ten tons need to be supported by the landing gear.
This makes things heavier.
Also, where do you get ten tons of water from, where you at the same time can't drive a truck?