I generally carry mine, but I only recall needing to show it once and that was in Central Asia somewhere.
The Colorado registration 'document' is a small, xeroxed-looking piece of paper- it looks fake even to me. The title on the other hand has swirls and curlicues and stamps and signatures and looks OFFICIAL. The border official (I think it was Azerbaijan) frowned at the registration, and smiled broadly when I pulled out the title.
Having said that, I don't think you need to have the title with you.
..............shu
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