[vanir]

Once again fellers you're dealing with ordinance types and real world effects versus imagination drawn from fiction, commercial media, games and egos. The simple fact is nuclear tests have been performed with observers within a kilometre sitting in armoured vehicles. That's hundreds, not thousands of yards away. Their protection? Special glasses (and a tinfoil hat no doubt). Many armoured vehicles are designed to withstand nuclear, chemical and biological warfare, let alone conventional blasts in some proximity. Why? Because they're naturally hardened for it to begin with. Check out some Soviet Cold War AFV doctrine.
And while you're at it peruse the many interviews with tank commander vets in various documentaries, there's plenty with British crews on/after D-day and their encounters with Tigers and just what it took to stop any one of those things from decimating entire brigades.

There's two issues you have here. One the il2 engine isn't exactly the most hyperbolic supercomputer in the world from what I've been told. Secondly, corroberative research at physics and military sources is the best place to gather an argument for a historical or real world differences to an aspect of il2 so the modders have genuine information to work with. At worst, you'll widen your horizons and maybe learn some unexpected stuff, always interesting.