Anytime a Cdn enters US as a tourist, they are entering on b-2, which pre-supposes they have a home in canada.
When you did this several years ago, the officer was able to determine that you were a Cdn resident. No doubt you had a provinial license plate for one thing. he correctly assumed yopu lived in canada... AND were going to head back to your home, job, family,etc.
Now, assuming you did what you wer supposed to do and formally bring your car into US and get it platerd there, he's not going to assume you live in canada. Also, he may ask you 'where you live'. Are you going to lie? He's going to ask you the purpose of your visit. Are you going to lie? You cannot say "I'm going to look for a job". Also, he will ask you "how long will you stay". Do you know. If you don't he then start asking himself "what makes me think this guy is going to return to canada at all", and he'd be right.
Just file the I-539... not I-435 or whatever highway that is.
Cost: how much is it going to cost you to drive to canada and stay there a few days.. and risk not getting back on top of it.