So what happens when you legally can't carry your hypothetical fuel? Does the chance of such probelms disappear because you are at Max LDG Weight?
In my particular company's operations it happens infrequently (but isn't unheard of). I ask operations if they want me to offload bags, pax or both to enable us to take the fuel we require. Alternatively, I tell them to plan me a tech-stop, so we can uplift the fuel that we require.