About 2005 i had an Xreg Renault Premium 400 converted from artic to rigid with a 28 flat Midlift was moved to the rear to make into a tag lift.The conversion was done by Ritetrak Engineering of St Clears West Wales the conversion was perfect never had any problem with the vehicle I ran the vehicle for a number of years before it was sold on to a livestock haulier then an engineering company and no one had any problems. As for paperwork it was all done for me took unit in and took 6 wheel rigid out