I have seen about two documentaries where pregnancy was simulated in the body to trick the body into producing milk but I am curious if this has actually happened to anyone here? If so what were the results in terms of nutrition etc...

I ask this because I do plan to use a surrogate mother one day in life and I am curious if this is becoming more common practice in couples where this is possible.

Note: I saw the documentaries in 2009 so I expect in 5 years this has become a more common trend.

Very possible. Google protocol for women with menopause lactation.