My post might be a bit late, but for what it's worth...
I've been to all the countries you mentioned last summer by BMW F650. No problems whatsoever.
Depending where your're from, be a bit careful when you discuss politics in former Yugoslavia. If it can't be avoided, just know who fought whom 10 years ago. Don't talk the side down in who's country you are at the moment. I often met lokal men, be it in Serbia, Croatia or Kosovo and just about all of them had been soldiers in these wars. Beeing German they liked me everywhere - except in Serbia :-( But even there the inevitable political discussions were always civil, even though we disagreed on some points (EU membership, ethnic problems, NATO-bombings of Belgrade, etc.). Try to avoid this if you are not very firm in recent Yugoslav history. If you can't avoid it just listen and agree. They take offense easily. Generally, all people were extremely friendly, even border police.
I don't know about camping. I stayed in hotels and payed an average of 22 Euros per night.
If you need to hitchhike on Autobahns try to make it to a busy rest area/petrol station. Just approach people there and ask them for a ride. That usually works.
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“It’s just a walk in the park!”
“You mean people are going to mug us and steal all our money and kick us viciously in the ribs?” Terry Prachett
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