WelshGas
Retired after 42 yrs and enjoying Life.
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There is a sticker in the Service/Handbook, under the Dashboard or on Drivers seat base that shows the Option Codes for all options fitted.Hi, when I registered with VW Online I can see full specification of the vehicle - pre wiring is not mentioned in there, but I will double check. Don't know what VW Erwin is
Google VW Transporter Option Codes and you can read the details for each code.
I can find nothing in writing to contradict the VW information that the OEM Westfalia Vertical loading , supported/unsupported is anything less than 100kgms.
The majority of towbar bicycle racks state a loading capacity of 60kgms or so, 2-4 bicycles, and the racks normally weigh about 20kgms, so a total weight of 80kgms. All are advertised for the Transporter with no additional qualification as to which towbar to use.