I also spent 2 years living on a motorbike went 15k km all over Vietnam, Cambodia and Laos... some of the most remote places... never once had an issue with anyone.
That said, in this case, I wasn't sleep out in the middle of a forest but I do have friends who do it more camping style and they haven't had issues.
I guess it is all just luck of the draw (or some say, karma).
