It is kind of different hearing someone come at this question from the opposite direction of most--those who want to get the "traditional mortgage loan" due to its lower interest rate.
It is impossible to get a traditional mortgage loan on a manufactured home UNLESS it is sitting on a foundation, as the lack of a permanent affixing to the ground makes it personal property, NOT real property. (Lenders want the stem off, most want at least double-wides, etc.)
There are also many other issues with manufactured homes--if built before 1976 it is difficult to get financing (new standards went into effect that year, which lenders want); many tend to be on large tracts of land, which shifts the loan from being based on the value of the residence to being more of a land loan; etc., etc.
So, you are in luck, you can get the loan type you want. I believe the builders of these homes are one of the best places to start in finding a lender, as well as your local credit union or bank.