The unimog camper is a serious investment, both for initial outlay and running costs, and it will eat up your budget big time. On the plus side it is an outstanding machine and you will have plenty of room and load carrying capacity, so living in it for an extended period will be comfortable enough. Now for the bad news, if you want to use campsites in europe your budget will evapourate,so wild camping is the order of the day, and finding a suitable place with a large truck has it challenges and becomes a real pain, a mog is not discreet, and if you hurry through europe, you burn your budget in fuel. What I'm trying to say is, do you really need a mog ? how often will you need the off road capabilities ? on surfaced roads it will be slow and thirsty. Using a car/van based camper could save you a fortune over the term of the trip but will not be as capable on the rough. For our next trip I will be looking to use a landrover/hilux or somthing similar with a box on the back for living space. Vehicles aside if I were you, I'd just go and do your trip, the worst that can happen is, you dont like it so you come back ! don't worry about setting objectives etc you will automatically do this as you go (places to see things to do etc). Whatever you decide I hope you have the time of your life......cheers