Good evening.
Hm, changing a cam belt with 50.000 km? I can't imagine this. In all the years, with all the different cars from different car manufacturers this was always between 120.000 and 210.000 km. Looking back I can't even remember that there was a time suggestion for chaning, just the km.
I can't imaging that the VW Transporter needs this in this early stage done. Builder, craftsmen, couriers, emergency services (Police, fire brigade) would not accept that such an expensive repair, service needs to be done on the transporter.
At the end of this year I would get around the 50.000 km mark. Because of this I will check with VW Ireland and VW Nutzfahrzeuge Hannover what the offical recommendation is. I would be shocked if they confirm in an eamil that the cam belt should be changed after 4 years and / or 50.000 km.
Regards,
Eberhard