I had a similar problem with absolutely no road feel in the steering in a new 2005 E350 Class B. Driving it was a bit like playing a video game. It was replaced with another new 2005 E350 after being totaled by an 18 wheeler. The second one didn't have the steering problems the first one had. I talked with an engineer who used to work for Ford and he told me that the problem could have been a feedback issue in the steering loop in the computer. He said it could be fixed with a firmware adjustment by a Ford dealer.