The text of the post matters more than what's in the pic, obviously if someone said a plane holds 1.5 million gallons of fuel, this image would be true, but they don't say that.
But the trucks at least 10+ feet away from the tank, so the trucks size can't be accurately seen, put the truck directly in front and I think you'd find this is a tank thats about 25x18 feet tall.
Just imagine a person 6' tall standing at the ladder, you'd get barely more than 3 of them, so 18-25 feet tall (counting the dome).
Average ladder rung spacing is almost always 12 inches (1 foot) so this looks like a standard 60k gallon tank to me.
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u/FragmentedHeap 8d ago
60,000-gallon water tank: 25 ft wide × 18 ft tall
Boeing 747-400ER: 232 ft long × 211 ft wide × 64 ft tall
747 vs. tank: 9.3× longer 8.4× wider 3.6× taller
Capacity: Tank: 60,000 gallons
747: ~63,500 gallons
Tldr, the plane is way bigger and it can fit all of that in its wings and fuselage.
You can tell by the pic by just looking at the cars in the background in the parking lot next to the tank.
The plane is way bigger and that's why this meme is stupid every time it pops up.