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Hi there. I am a new member to this forum. Here is my problem I have a 2003 Winnebago DL motorhome with a Demco Aluminator tow bar, Air Force One braking system. My tow vehicle was a 2003 Saturn which towed flawlessly for over 10 years. last year I purchased the 2014 Ford Cmax energi because it was listed in the motorhome magazines dingy guide. The guide stated that this car could be flat towed and the only thing you needed to do after hooking up the tow bar, electrical connection, braking system, emergency brake cable and safety chains was to put the car in neutral and press the start stop button and not exceed 70mph then after towing you start the car and shift thru the gears and turn off. The Ford manual states the the car can be flat towed behind a recreational vehicle by starting the car, put the trans in neutral and push the start stop button which puts the car in acc mode and hooking up and go not to exceed 70 mph and do the start shift thru the gears and then turn off. Shortly after buying the car I had the baseplate and braking system installed and soon after we started out trip and everything was going great for around 3,000 miles. Then "IT" happened I pulled into a dirt parking lot made a circle so that I was headed out after having breakfast we made a slight left turn than a right turn than a stop at a cross road as we turned a fairly sharp left turn the car started to cause the motorhome to shake left to right violently the front tires of the car where shaking back and forth violently. I stopped the motorhome then started up slowly and the shaking stopped. I pulled back into the parking lot and called a tow truck to take the motorhome to Freightliner thinking that it was the coach after 4 days of checking they could find nothing wrong and the car drove fine when not towed. So we headed home from Arizona to California and had no other problems the rest of the trip. At the time I thought maybe it was the road so when I got home I drove around my neighborhood making many left and right turns and the shaking started again more than half the times making left turns and a little less turning right. At this point nobody has a cure for this neither Ford, Demco, Air Force One MotorHome magazine or alignment shops. I have been able to find two posts of people who have had the same problem so I 'am not totally alone in this. Anybody who has any answers to this will be greatly appreciated I have tried everything I can think of to find the cause. My guess at this point is the suspension and or steering but Ford can find no problem with any of them.