Clearly the answer is to extend the frame in the center of the chassis to give improved towing stability. Chop the toolbox lift part off right behind the drive wheels and insert it in front of the drive wheels so that you don't have that nasty rear overhang which also makes towing more difficult. All you need is a sawzall, some welding, a custom driveshaft, and some extended brake hardlines, and voila!
What are you waiting for anyway? The Shaguarillac or Caddilaur-Rex or whatever you call it needs this as its tow vehicle, sir. NEEDS IT! 
Pat Mulry, TARP Racing '67 SIMCA GLS 1000
"The SIMCA 1000 rear engined saloon is not a car which is going to be remembered in years to come for any particular reason.... It is not startling for its beauty, innovating with its design or particularly fast, economic or comfortable. However, it has been successful for SIMCA, especially in France."
--SIMCA 1000 Owners Workshop Manual, J.H. Haynes, 1973