I would think either putting a newer mobile home or regular house on the lot would be smarter financially.
Unless of course, you are willing to either rent it out or to owner finance it.
Owner finance can find a lot of buyers I hear. Especially those with less than great credit.
The home can be sold, but as you have now realized, not as easy as a stick built home. I would suggest that you try to list it through the development if possible especially if they are selling other manufactured homes so you won't be competing against them. It can be put in the MLS under land contract and also sold "cash" to an investor. There are also several banks out there that do finance manufactured homes but you really have to do your homework to find one. The last I knew Greentree was the only bank that was financing them. Good luck, call if you have any questions.