I'v been to the states twice,and returning to Canada was so smooth, it didn't take 5 minutes at the border;however,when i visited Turkey , a country on border with my country, it was tougher at the Canadian border. They have searched everything you can name,but i was cool with that,because i haven't visited my country so there is nothing to worry about. They asked me too many questions that i can not remember now, i was honest with them and eventually the let me back in Canada.
Btw, the CBSA officers were nice, they asked for my permission to search my items,eventhough they can do that without it.
Just be cooperated,and honest,don't try to argue.
I will continue to use my travel document,eventhough i haven't received my PR yet.