This is a pretty neat and simple explainer of how 4x4s work, and how it differentiates from AWD, and those with part-time 4x4. Though I've never heard of it being called 2x4 before, since I'm used to front-wheel drive (FWD), or rear-wheel drive (RWD), but it's great to learn new things.
Using that Defender as an example for approach, ramp-over, and departure angles is pretty great too, since these Defenders are mad off-roaders. Yet, I was somehow expecting Grouchy to make an entrance here. Maybe next time, you can get Grouchy to do some off-roading for sick action shots! Though, this being Grouchy, I can only expect one outcome from this...
RE: Where the bitumen meets the gravel