Some more fact-checkiing from Ken Tindell via Twitter: "A nickel weighs 5g. It would take 2,755 18-wheeler trucks (max legal tare 80,000 lbs) to carry the money."4) Consider how much a billion dollars in nickels would weigh: you need 20bn of them, and at 5g each that's 0.005 kg x 20,000,000,000 = 100,000,000 kg = 100,000 tonnes.
I'm not even sure 20 Billion Jefferson Nickels have been produced since 1939
& there certainly shouldn't be that many lying around in storage.
If there is, they need to stop minting nickels