Of course it may sound irrelevant, but if you set-up and armory-like mission and one vehicle in a small narrow parking position gets destroyed, the respawn module respawns that somewhere else, sometimes causing massive destruction.
My take on this would be to simply add a delay after deleting the vehicle and respawning.
Or check this:
http://forums.bistudio.com/showthread.php?161212-Vehicle-Respawn-Module&p=2544271&viewfull=1#post2544271