Sounds fab -it's our next big trip too. Last year we got a Bongo (little 8 seater van converted to camper) and drove around Europe for 4 months - DC were 2 and 4. We can't wait to do another trip and this time it will be around Aus - hopefully 6 months and we will homeschool.
Things to consider -we planned to do little (in terms of busy itinerary) and ended up doing even less than we planned -and tbh that took some getting used to. By the time we got up (not v early!), ate, washed dishes, faffed about, packed up, did some washing, packed drinks and snacks etc etc, we rarely got away from the campsite before lunch. Eating lunch was the next activity, and then we usually wandered about the town/village or 'did' one attraction before it was time to come back, cook dinner etc. It was a very slow pace. Anyway, we grew to enjoy it, and to accept that half the days activity and half the adventure was the actual camping itself - the camping was not just a cheap way of seeing Europe iyswim.
We also found we couldn't drive as long as we'd expected - 3 hours in a day was loooong for our kids. They were actually pretty good in the car, but by the time we'd packed and left the campsite it seemed a shame to spend the rest of the days sitting in the car, and whilst DH and I quite like 'going for a drive' and looking at the scenery, the kids didn't really seem to take much in unless we actually stopped and got out of the van.
Our original plan had been to go for a big drive (like 5 hours one day, then 4 hours the next) and then stop for a week, but what we ended up doing was driving for about 2-3 hours every 3 days or so.
Make sure you have enough space to spread out a bit when its cold/raining/nightime. We had the Bongo with an awning/tent attached, but by November it was so cold in the tent we all ended up sitting the dark evenings in the van, which was a bit tight really!
You really MUST do it though.