It may not be a problem with the MH at all. When we bought our MH last year my wife and I brought it back from Montgomery, AL. I was driving and she was the co-pilot. She was terrified all the way back! She was constantly screaming that I was running off the road! I have to admit that I did get over on the warning track a few times while I got used to the width of the MH.
After a year she has finally gotten comfortable with it, but it took a long time!
Don't give up, you'll make it!
Good luck, happy trails, and God bless! :B