@Florin Smolnicki is out colegue that can speak Deutsch (but no English!). And he can help you with your Deutsch problem. He lives in a county near Iasi. 
To spend the winter in a camper/caravan you need a lot of things. You need a proper insulation, so your caravan needs to be a winter caravan. You need a warm place for personal care, shower etc... Because winters in Romania are cold, water will freeze. You need to have water inside the caravan, at warm. An power source will be also in need because solar systems are not enough in winter. 

I think is cheaper to spend the winter in a proper house than in caravan. Spend the Sping-Summer-Fall in caravan and the winter in house!