Radiator? Hmmm first we should probably ask how old the kombi is. Those old T1s with the portal axles can go anywhere... Also, if it's a has-radiator kombi it could be a synchro or a 4Motion...
Anywayz, I did it with a Fiat Uno in the late 90s and with a Golf about six years ago and the road was significantly worse six years ago. Should not be an issue with a kombi, especially going down.