while travelling in europe this summer we saw a trailer connected to a camper rapido via a normal towbar but what caught my eye and other camper owners was that it also had 2 arms attached to the trailer which appeared to to be pushing against the lower chassis of the camper. this allowed the camper and trailer to effectively act as one unit. they parked and turned the camper and the trailer stayed in line. there was no snaking etc. it was a very short trailer , just the length of the trailer wheels. anyone seen anything like this . it seemed to be a professionally built trailer . the camper was italian.