I'm in a clan and I can guarantee you we wont park them off the map somewhere and let them collect dust, especially the heli , what fun would that be. We are careful what situation we use vehicles in, like picking up new spawns is usually done with atv/motorbike or sometimes a car depending on what we have. When we have something like the Ural(blue truck) with its crazy capacity to hold gear that puppy usually is parked as a mobile storage shed. If we find an enemy base big enough to warrant it we might use it to grab everything in one go