The GRP body comes, without doubt, from the Polish manufacturer ISS Wawrzaszek (moreover, the ISS-W logo can be seen behind the ladder on the right - next to '1'). The 'R' on the left is certainly not Rosenbauer's logo, it probably belongs to ISS's local Norwegian/Scandinavian partner.
You are, naturally, right Konrad. Wawrzaszek has build the last three engines/pumpers delivered to the Bergen fire department. One of the others can be seen at No: picture 23826,picture # 23385 and picture 23386.
The "R" comes from the local (western) Norwegian partner/agent of Wawrzaszek - Rosendahl. Their logo can be seen at their website Rosendahl.no
This vehicle, which also can be seen at No: 23820, does not belong to the main station in Bergen. It belongs, as the marking on the top rear of the body says, to the station Laksevåg.
Added by Konrad Nowak on 25 June 2010.