The best answer I may think of is to bring any document that you think may help your case.
I would bring aaaaaaaaaaaaaaaall doc that may prove my ties to Canada(lease, bills, bank statements) put everything in a briefcase and, if it's too heavy, have someone carry it with you. No harm if you bring too many documents but the problem is if they ask for any doc and you left it at home.
I still didn't apply but I already have the briefcase ready and whenever I think of a doc that may help , I put it inside.