You would most likely need a signature loan. Very rarely will you be able to receive a loan on a mobile home that is not on a piece of land that you can secure with the mobile home, if you have amazing credit and have been with your credit union for a long time they may, but it is at their own discretion.
Mobile homes are sold more a car if their is no land.
it's been a long time since banks did these type of loans.
but if I'm not mistaken, you have to get a personal loan for the trailer.
but check with American first CU, also try Google mobile home financing.