Not true. T1 charges just fine. Coding should be 0000002. Pin 4 is hot even with no key so unplug trailer overnight.Different socket arrangement in the UK/EU but the principle's the same.
AFAIK, VW only started wiring the socket(s) for fridge & battery charging from the 2015 model year. Prior to that, only road lighting circuits were provided.
You'd need to check the VW Canada specification for your model year.