Well I needed to make some so my son and I are tearing down a double wide. I will not do it again for free or only scrap. You will need help. Depends on your prices on steel. The one I'm doing has copper wires but no copper pipe. One a single wide you may be looking at around $600.00 maybe $700.00 if you break all down. My yard gave me alum. Sheet price which was .60 per pound and it was all dirty. So just remember you are in for a lot of work. Let me know if you have any other questions.
Good Luck Ced