I think you should be able to utilise this space in some way, it's a lot of space going to waste.

With their current system, it's literally dead space you can only 'manually' use (put cargo on there without packing).
In the code, the cargo area position is only defined by the starting point and the spacing. Maybe there will be a 'multi-tier' cargo system later on, but afaik that isn't doable yet client-side.

Alternatively, perhaps some modder can add maintenance stuff there, for repairs and/or fuel.

@Alighierian To justify the size of the trailer, i think this space needs to be utilised in some way. That could be a cargo slot or maintenance stuff.