And maybe, for those seemingly strongly hung up about the supposed carry-capacity of the Opel Blitz 3-ton - 4x2 OR 4x4 - perhaps there is something "telling" about that armored 4x4 FlaK truck...
It apparently was set up - at least as photographed - to carry that 2cm FlaK 38 single-barrel gun. The Germans already understood quite well the limitations of that gun as an anti-air weapon by mid-1942. It didn't track fast enough to engage close-in aircraft, it didn't have enough range to engage modern planes before those planes got within their gun range, and it didn't have anything like sufficient fire-power (small projectiles, slow mechanical rate of fire, further slowed down by using small mags, and prone to getting quite hot quite fast during firing) to effectively take on the heavier aerial killers such as the Stormovik (sp?), etc. And the (much heavier...) 3.7cm FlaK 37 and later the FlaK 43 guns were available (and much more effective, too). And the FlaK-vierling 38 (again heavier) was also available. Yet, in reality, what we see is that this armored truck apparently was slated for that less-effective weapon - and, in truth, there were very few FlaKvierlings, and very few 3.7cm guns ever mounted on these Blitzes.
Our very interesting debate about 4x4 vrs 4x2, load capacity, etc. aside, I would bet that those Germans actually KNEW what they were about when doing these conversions. They had had, as early as May, 1940, plenty of unfortunate experience with trying to actually put guns on "anything that moved".
Just some food for thought.
Bob