The value also depends on the demand for mobile homes in this area. I would try to find out how long they have been trying to sell this home. And ask what is the seller's motivation to sell. You may want to talk to other owners of similar units in the neighborhood to find out if their any any other issues, and if their are any other costs ( monthly pad fees, utilities etc.). Also I would get a professional to estimate what the repairs may cost you.
All the best,