First, there would not be a risk in terms of person-to-person spread in that particular setting. The same is true in Canada as it is anywhere else in terms of general public health provisions.
In terms of the issue at the border, in a personal conveyance, whether you've rented it or not, basically, you as a person have an obligation to declare that you have an infectious disease. This provision really relates to advance notification--in other words, phoning ahead to notify the quarantine officer.