Or box truck in the US. As I said in the other question on "furgoneta de chapa", I think this is the distinction. Here one can be a little more confident because there are plenty of references to furgonetas carrozadas and they all seem to be box vans rather than panel vans:

https://www.google.es/search?q="furgoneta carrozada"&num=100...

There are pictures here of things that are not box vans, but of course an image search gives you pictures from pages on which the search term appears, but which do not always relate to the search term.

It would make sense, since "carrozar" means to put a body on a vehicle, and with box vans the cargo area is a separate structure that is often fixed to the chassis by a body builder; the manufacturer just provides the cab and the chassis. So it is a furgoneta that has been carrozada.

Here's Wikipedia on box trucks (US) or box vans (UK):
http://en.wikipedia.org/wiki/Box_truck

The only thing that seems a bit surprising is that the loading capacity for the carrozada (1000 kg) is less than for the chapa type (1350 kg according to the other question). But you can get more pallets in it, apparently. Both these types come in different sizes.