"Fits in a normal commercial truck" is an important criteria for keeping transport costs reasonable. If it fits in a truck, you can build a factory and ship the

"Fits in a normal commercial truck" is an important criteria for keeping transport costs reasonable. If it fits in a truck, you can build a factory and ship them without needing to arrange a bunch road closures with every delivery. Though you might need to close roads anyways, not sure what the rules for transporting nuclear fuel are.