I want to come traveling with you! Sounds like great fun!!
It depends what your expectations are. I always try to master at least "yes, no, good morning/afternoon and how much" in the local language. Never forget that in some rural areas, the locals may never have seen a foreigner, let alone one in a camper, so you can be an object of curiosity. Go with the flow, be respectful and as diplomatic as possible. I take a stock of boxes of Quality Street sweets bought cheaply at Christmas; handing these round can work wonders. I find that, in general, people want to be friendly and find out more about you, your life, your home, family, politics(yes!)earnings etc.etc. and the more they find out about you, the more you find out about them. This really is one of the main reasons why I travel.
In my Kombi days, we were about to park up on the edge of a wood in Northern Greece when we encountered four shepherds, about 10 massive dogs and a few hundred sheep. I said hello and was asked our intentions. Explaining that we intended to stop for the night, the shepherds immediately told us that there were wolves and bears in the area and we should be careful, suggesting that we parked near their mountain hut. They then showed us the spring that they took water from and one asked what time we would retire. Seeing that I was a bit hesitant to reply, he explained that they would be eating later and would we like to join them?
Spit roast leg of lamb washed down by local Retsina never tasted better. No campsite can replicate that.
If there were any bears or wolves around, we didn't see or hear them, because we fell into a deep sleep, replete.