More options are always good!
I would agree with JaSAn, that option 2 is a non-starter. Wood heating is just not a practical option for a truck camper, way too hard to regulate the temperature, the tiny stoves need constant attention, and they are dirty.
Option 1 looks interesting, essentially a 'no moisture' alternative to the silent Wave style heater. Briefly looking at the spec, it may end up taking up a lot of room as it needs 6" clearance all around, so all of a sudden in becomes 18" x 18" by however tall it needs to be. Without forced induction, I assume the flue needs to extend some distance out the top to get a 'stack effect' to draw air through?
If you can find a way of buying one - the Truma Combi would be my choice.