Hi
This is probably too late to be any help to you, but for anybody else researching ...
I travelled Vietnam --> Cambodia --> Laos --> Vietnam on a rented Vietnamese bike.
The only paperwork I needed was the original registration card and a letter from the owner confirming that I was allowed to take it across the border. Actually, I don't recall anybody ever looked at the letter, but best to have it anyway, if you are renting.
Your crossing should be a lot simpler than mine? So there's a very good chance you will get through OK.
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