I agree with Kyle, and go to jdpart to compare the frame members and transmission parts. The axles at least need to be changed, and possibly tranny as well.
How much are you willing to spend for a conversion?
And what gives you this idea that it is even feasible, possible, or less costly than trading up for an AWS? Just curious here.
I will agree that the AWS is a great way to go, and wouldn't be without mine.