When I landed in Toronto, the woman at passport control told me that there was a small chance that immigration would ask for my goods to follow, but that it was more likely they’d do it at customs. I ended up being directed to customs.
I only ever told the officers who processed me that I was “becoming a PR”. In immigration, I was asked for the address I expected to be living at so that I could receive my PR card. YMMV, though, since different officers ask different questions. No one ever asked me how long I was staying once I was in Canada and the officer who processed me seemed inclined to just let me go.
Even if they don’t start processing your PR card, you can just update your address online/over the phone to get the process started.
Re: the original thread, I do not believe goods to follow can be updated. It’s more of a one-and-done deal. You can try to persuade the customs agents that you should be able to import the car duty-free as a “settler”, but you will have a very hard time with a brand new car, especially if you’ve owned it for less than 6 months. The settler’s exemption stipulates that you should have owned and used the belongings for at least 6 months prior to your move. You’d be better off selling in the US and then buying in Canada. Saves you the hassle (and unavoidable fees) of importing the car as well.