big difference in propelling with the sole mode of control and power being at the rear from a dvt which has control at the front and power at the rear,likewise even an auto coach has control at the front, for a time when we first opened up we propelled with a driver sat in the rear coach in a specially made drivers door,with lights,horn,comms to the engine, thats fine on our side, now go through the paperwork with NR telling them youd like to!