Yes, there were normal vans with raised roof and ambulances without raised roof, as they were built by various coachbuilders
Examples:
https://www.autobelle.it/altre-immagini/immagini_annunci/7/75885/lista_75885.d1523612864.jpg
https://live.staticflickr.com/4191/34312647910_de7b4e8177_b.jpg
https://live.staticflickr.com/7805/46646126231_a831bb7a2c_b.jpg

I think the one you linked could be a custom camper

Anyway I agree with you about the use in official documents. I'm not sure if Seat always has used the all uppercase version?