the Magnolia Pearl, an Airstream Land Yacht

https://www.pinterest.com/pin/268245721529982888/

http://avax.news/wow/Magnolia_Pearl_Airstream_Dream_Machine.html

Found on https://www.facebook.com/SteampunkTendencies/?fref=photo

and it gets towed by a Rolls Royce laid over a 4x4 vehicle