+1(514) 937-9445 or Toll-free (Canada & US) +1 (888) 947-9445
For what it's worth, my husband traveled back and forth across the border a lot and the amount of travel created challenges for his citizenship application in proving the days he spent in Canada. He got something called RQ which is a pain and forces you to collect tons of additional evidence to prove your residency days. Make sure you keep good records and also have activity that proves you've been physically in Canada on the days you say that you've been here.
Hi @scylla, May I ask how did you deal with the car registration issue when you did this. I have similar problem where I will work in US during the week and come back to Canada on weekend. I will have addresses in both US and Canada, and think to get US car and driver's license. Can I drive US plated car in to Canada as a PR.
 
Hi @scylla, May I ask how did you deal with the car registration issue when you did this. I have similar problem where I will work in US during the week and come back to Canada on weekend. I will have addresses in both US and Canada, and think to get US car and driver's license. Can I drive US plated car in to Canada as a PR.

There was no car involved. My husband took flights when he went to work in the US.
 
Hi @scylla, May I ask how did you deal with the car registration issue when you did this. I have similar problem where I will work in US during the week and come back to Canada on weekend. I will have addresses in both US and Canada, and think to get US car and driver's license. Can I drive US plated car in to Canada as a PR.

Residency becomes a factor. It appears that you are truly a resident of the US and visiting Canada on the weekend.