This is the first time I’m seeing this question: that you have a CoPR (and presumably a PR visa if you’re not from a visa exempt country) and yet want to visit as a visitor.
As far as visa-required citizens are concerned, once your PR visa is issued, your visitor visa is no longer valid, i.e. they may not physically remove it or stamp it as “canceled”, but you cannot use it to enter as a tourist. Doing might be a violation of the immigration laws. I’ve never heard anyone doing that so I don’t know what the consequences are. I don’t know if things are different for visa-exempt countries, but I presume you are still violating the law if you are an approved PR but don’t land as PR while “visiting” Canada.
But why take the chance if you’re already an approved PR.
If someone has a definitive answer please feel free to share.
Regarding the GTF and car transfer, you don’t have to do it during your landing, you can do it later while actually moving. In case case, GTF just involves broadly categorizing all your worldly possessions (throw in the car if you want) that you will be bringing into Canada. Took me about a day to do it.