The Pilot P650 is based on the Fiat chassis. For insulation, it has a 28mm thick styrofoam wall and for sitting comfort in the lounge, high density foam. Pilot says that the space inside is desgined for ease-of-movement. There is a choice of either the Truma C4000/C6000 or Alde heating systems. It has internal LED lighting throughout. See more in the video!