You are right, it’s not personal. What can I say?
Well, I did the math, and according to my calculations, if you put a cf of U in the trailer, and filled the rest of it up with Pb, 3,999 cf, then the cargo would weigh 1,422.23 tons.
The Thialf, a tandem lift crane, can lift 14,200 tons, so our trailer load is about 10% of its lifting capacity. The Mammoet can lift 4,000 tons.
Please feel free to check my calculations.