This would allow to neatly load sweet trucks with cargo (boxes, ammocrates, and what not), while using the whole cargo-area and still not having those objects clip into the benches.
And given this is not only a graphical nuisance (disabling seatings/functionality of the truck), a proper solution would be most welcome.
P.S. If you could make sure that we could easily extract the exact position and area of such "cargo areas" (EDIT: "cargo volume" would actually be more appropriate for closed trucks and Co.) on vehicles (relative to the vehicle itself) from the config or by means of a script-command, then that would be really sweet. Guess that needs to be defined in some LOD; so if not for A3, maybe think about it for A4? M'kay? ;)