First, if constructed to HUD building code after June 15, 1976, they are NOT mobile homes, they are manufactured housing!!
May I suggest you read an article I wrote that is published at
http://www.naifa.com
Click on January 2002 Appraisal E Gram
Scroll down to October 2001 Appraisal E Gram
Scroll down to "What is that--and now what do I do?"
And all your questions will be answered.
Fannie Mae has issued a complete new set of guidelines for everything that goes into effect June 30, 2002. You need to get a copy of that because it has some changes to what they require for homes that they will finance.
You can down load to your computer a copy at:
http://www.srappraisal.com/FNMA
Download the 4_12 file, the other files is the old property and appraisal chapter.
Also--what state are you in? The Appraisal Boards for Alabama, Georgia, North and South Carolina, Texas have some excellant articles on their web sites.
And you could also check some of the postings I have placed on this forum, just look for my name.
And do not use the expression mobile home again for a home constructed after June 15, 1976 to HUD building code!!! I don't care what your client or the owner or your zoning or your building department calls them. For financing there are some very specific terms that mean very specific items.