P51guy
Flying mostly to central america, south america and the caribbean I don't think any of those countries would park trucks on their runway to not let you land in an emergency situation.
Flying one night over Port Au Prince in the mid to late 90's on way to the South, a Lear Jet radioed pan, pan, pan to Port Au Prince and simultaneously declared emergency with some sort of mechanical difficulty and informed PAP that he was going to land at PAP. ATC actually answered rather quickly (!!!!) and informed the Lear they could NOT land PAP. The pilot pressed the issue and was informed by ATC that it would be fired upon if it attempted a landing at PAP. The Lear diverted next door to the D.R. at Santo Domingo. Apparently there was some sort of coup or somesuch and Haiti wasn't accepting anybody that evening.