First, check with the park to see if the mobile home can stay if it is sold. If it is too old or in disrepair, the park can require it be moved. The park may also need to qualify the buyer separately to see if they can live in the park. Both age and income can be reviewed.
Make sure you cover all disclosures during escrow, as you may be held liable. Mobile homes have their own set of disclosures. Get a hold of a good escrow and title company to help, but you are still responsible to make sure every document is covered with the buyer. If you do not hire a real estate agent, hire a real estate attorney.
Guidelines for mortgages on mobiles also change frequently. Find an experienced loan officer that can help you and the buyer find an appropriate loan.