This will mostly depend on you, your credit, income and assets. A lender who does mobile home loans will be the best source of information.
It sounds like you own the land and singlewide now out right. That you're selling the singlewide to someone else. Will they be moving it off the property or are you going to lease landspace to them?
I'm a bit confused about your goals, but my answer is still going to be talk to a local lender who does Mobile Homes. Consider Washington Federal and US Bank along with any others you know.