i get what your sayin O Neil
i started a mission sorta like that while back but due to unfortunate circumstances i no longer have it
you would like a mission with 2 or so teams of at least 4 or 5 men to each that are "Stranded" on the island so to speak where they have no idea what they will find and where, the island is practically Deserted other then them being there and the remnants of the Former inhabitants still remain so if you go to a town your likely to find a car or 2, go to a bi town you might find about 20 or 30 of em etc..
and guns, ammo, equipment, etc.. is stranded all over the island to absolutely none of the players knowledge as to where they are and if they are really there (unless of course you made the mission) along with the fact you have to kill each other your best to find shelter or place to make camp before running around for stuff
you could start near a town or start miles from the nearest road, you have a choice of finding equipment and taking all you can find as to not allow the enemy to get it or you can just use the equipment you have in the beginning and risk getting wiped out, you can find vehicles, weapons etc.. and if you get anything you have to protect it untill you get to base because you have no idea if enemy is around or not, you may even find some mountable guns that you can mount anywhere you like and get a inf on for more defencive options etc.. you may find tanks, or feul trucks, maybe a ammo truck filled with guns and explosives
and all vehicles have a certain amount of fuel so some may be full some may be empty and some may get you 3 feet before dieing
let me know if im getting close to your invisionment of the mission