We use them and like both the functionality and the tradition. There are 'deep' and 'standard' dutch ovens, and I would start off with the traditional depth until you get familiar with them - a 10 or 12 is a good place to start. They can be heavy (we carry two at the moment) but not so much that you would have to worry about it unless you are backpacking with them. Just stow them like any other object you cook with - you can even stow things inside them as long as they are dry. That said, unless you can guarantee that they will be well lashed down I would not place them too high up, just in case.
1975 Westfalia (VW)
2014 Rockwood A122