Hi,
Noticed our recently aquired VW Camper understeered more than normal. Tyre pressures OK and so is alignment.
However roof rack had rubberised wood panel as a complete base.
Removed it and back to "normal".
The Kombi is very aerodynamic - believe it or not- and with Kamm type rear end there is enough lift under roof rack panel to give enough lift to cause understeer.
Warren