This particular truck pictured appears to have a footprint about the size of a Toyota Camry, but with far greater rear visibility due to the additional headroom and no rear seat.
It's much more common to park a truck backed in than a car, in order to load the bed e.g. from a loading ramp or dock. The backup camera is great for lining the bed right up to where you are rolling on the cargo.
You _can_ do it without a camera, but the camera saves a ton of time.