We do owner finance on mobile homes with land and use a certified loan originator / mortgage broker to do the processing. Using the originator allows you to comply with Dodd/Frank without running into any issues. In Texas you also have to worry about the Texas SAFE Act which is very similar to the Dodd/Frank and requires the use of a loan originator. The SAFE Act limits you to 5 every 12 months but the language of the act is vague and never really defines anything other than someone has to be certified. We do mobiles tied to the land they are on so not sure how these acts apply to only the mobiles themselves.
Without a loan originator you are limited to the amount you can do in a 12 month period but I think but this way you have an independent third party to qualify the buyer. We usually deny 2/3 of the people looking to buy based on things the loan originator finds so it works out well for us. The buyer pays for the service (usually $700-$1000) so it doesn't affect us much and is no different than an origination fee on a regular loan.