ditto what he said. I knew FHA would lend on mobile homes if they met a certain criteria but in our market there is a substantial difference in the price/sq. ft. of a stick built home versus a mobile mansionThis makes a big difference. Pre 1975 Mobile Home is Personal Property, Post 1975 Manufactured Home is personal property until properly attached to the ground, then it's real estate.
Always, always use like kind comps for like kind subject if at all possible. Using older farther away like kind comps is much preferable to different type comps close by.
What does your market say? Are newer manufactured homes being accepted in the same manner and for similar type dollars as a stick built?