Hi all.
We landed yesterday from Sarnia border. They did not ask for anything ( bank statement & enrollment letter ). I suggest you have them on you for landing. Be safe better than sorry.
I checked "London international airport" and "Detroit–Windsor Tunnel" but both said "this office does not accept landing from inside Canada anymore".
Police officer were nice in both US and Canada sides and knew what to do.
Don't forget duty free if you have want to do this process. Its very cheap.
Finally I got my PR after 4 failed tries. Thanks all for your helpful comments.
I hope see you all in "Citizenship Forum" soon !!!!
Don't hesitate to contact me if you have any question.