One of our Vietnamese friends told us that we had timed our trip perfectly since it would no longer be the rainy season. Yeah, not true. It rained at least for a few minutes every single day during the first week.
In fact, in the northeast of Vietnam, it was very rainy and thus very muddy. When we stuck to the main roads, we didn't have any problems. However, whenever we took a back road it got a little bit perilous: