The VA does not give mortgages for mobile or manufactured homes. A little education:
Mobile and manufactured homes are considered "personal property" - not real estate. If you buy or own the land or lot then it is considered real property or real estate and the VA will give a mortgage for the land only.
Real property or real estate is defined as purchasing the land + any building that is permanently attached to the land. Therefore since mobile and manufactured homes are not attached to the land, it is personal property and the VA will not accept it.
Another example is cooperative housing. I'm a former realtor in the NYC area and I learned from mortgage lenders that the VA will not finance cooperative housing because the buyer receives a certificate of shares to buy the coop unit - not a title or deed. Therefore without a title or deed, the VA does not accept it and the NYC area has million of coop buildings. The VA does accept condos because the buyer receives a title or deed to their condo.
Getting back to mobile homes, there are lenders that finance mobile homes but its not a regular mortgage lender. You need to go to www.mhvillage.com (manufactured home village) and contact lenders on that website. Beware that the value of mobile homes declines after you buy it. There is no equity and you do lose money.
A better solution for you would be to continue staying where you are and work on improving your credit. Cut down on your expenses, pay off outstanding debts and save as much money as possible. If necessary rent a cheaper place. Your goal is to get to 620 or better..