Hi, we have just got a 2007 Swift twin axel with 4 wheel motor mover (powrwheel). It is the electric type that engages with the tyres at the flick of a switch. All 4 motors do engage on the switch. When I test them prior to engagement only the front 2 rotate. The back 2 do not rotate. I have looked at connections and all seem to be ok. I have also plugged in the remote to see if that was at fault but still. I rotation. Any help would be greatly appreciated. We are new to caravaning so this all seems confusing at the moment!