All types of vehicles in A3, for the player as driver or as gunner, have interiors, only the heavy armor has no interior. Unfortunately it does not look fair. Creating interiors for heavy armored positions - driver, gunner, commander, will be one of the great improvements to the Arma and are also the perfect complement to the Advanced Driving Model in the Arma3. As seems to me, after Apex release, it must be one of the priority items, because this Improvements can be the best addition for Tanks DLC!