Foodtruck is not a tradition in Poland. I may have seen 1 or 2 in Warsaw, selling kebabs and Belgian fries but we could count the customers on the fingers of one hand.
Really? It's massive in Poznań - there was even a festival of them not so long ago.
facebook.com/events/1394619450862522
There must be at least 7-8 around in the centre at any one time. Like everything in Poland, one opened up and was successful, so it was instantly followed by 5 other idiots who sold exactly the same thing.
Having said that, I'm not particularly fond of them myself. I struggle to see the difference between them and a British burger van except the fact that they sell hipster soft drinks (attention Harry :p).