I'm not sure that is correct.
The VW Dakar alloys only have a rating of 875kg & they were a factory fit on the Berghaus special edition.
The standard 17" Arajuca alloys that I took off my van were 850kg rated.
There have been many discussions on other forums about whether particular VW rims are suitable to used on T32 vans & it appears quite a few are not.
Having said that, if they are genuine vw T5, T6 or T6.1 they will be ok load wise for a california, just be aware that not all fit over the bigger brakes.