There's a 6 wheel CX elsewhere on here but this one's even longer ! Reminds me of the AQC Jetway 707 airport coach from based on the Oldsmobile Tornado. maybe that was the inspiration for this behemoth.
Pierre Tissier is the man behind the transformation of many Citroën sedan into ambulances, vans and car carriers. Yes, car carriers. Tissier modified many Citroën including the one you guys like so much, the DS and the SM.