In reply to Crag_chimp_uno:
hi, loads of people have commented on the destination, etc., so I think I'll say something about cost. I did something like that a year and a half ago with my husband and wee boy and I was a amazed at how cheap it is once you get going. We were away for 3 1/2 near enough 4 months. We had saved up some money beforehand, but despite major car trouble (which cost a bit ) we were all right in the end.
So, this is totally from personal experience (we weren't too stingy on food etc and even had the odd evening out in a restaurant or bar and bought the odd new harness or gear, but I reckon, for the mere living expenses (camping, petrol and food, etc) we spent no more than £3000 pound, probably a lot less. That's for three people (or 2.5 if you like) and we spent most of the time on campsites due to the nature of the locations we went otherwise we would have been dirtbagging more.