[smileysteve]

Isn't fuel vapor more dangerous than liquid fuel though?

Contained vapor creates an explosion, while liquid must evaporate first.

[catalogia]

The strain the weight of the fuel places on the airframe during landing is the issue, not a risk of explosion. Furthermore fuel tank inerting systems can greatly reduce the likelihood of any problems.

[manigandham]

Sure, but I'm not sure what you're asking in context. It's not about fuel vapor but overall weight on the airframe at landing. The bigger jets are not designed to touchdown at the fully loaded weight.