Hello, Hristian!
I never heard that people had problems with H2 sunroof drain clogged but sometimes water could come under front markers when those seals are not good any more. But You can always fix them with some silicone or similar stuff. So if You like to have car of your dream- buy it and enjoy it! And don't think about potential problems! May be your truck will be problem free! Fix problems as much, as you can when they come, but don't think about them ahead!
Your country is very nice and warm. I like Kamchia a lot! It's very good place for vacation!