There is a difference between the mobile homes of the 70s and the manufactured homes of today. Manufactures homes are real homes, made out of real wood. They may be assembled in a factory or assembled on a lot. They have a foundation and everything else that a "real" home does. They're just put together.
Do some research. Go visit home shows and lots where these are sold and ask a lot of questions.
I wouldn't hesitate to purchase one if I had a beautiful lot to put it on. You get a lot more for your money. Check them out.