All vehicles that is prefilled with objects such as ammo and rifles have no room for additional storing, even though bottom storage bar says its almost empty.

However if you go into as passenger and enter the inventory then the storage bar shows the vehicle being full.

This is very unrealistic as for example an MRAP or APC can hold way more than just 2 rifles and 20-40 pieces of ammo.

Now i noticed all vehicles with no prefilled ammo share the exact same capacities, quadbikes, civilian cars, even the HEMTT and zamak trucks have the same storage capacity. The same thing applies to all APC's that for example just can hold 3 backpacks and no more.

I think you should increase the storage capacity by a factor of 10, and a factor of 100 for the trucks and big vehicles.