We have a customer who is interested in purchasing a custom built Tiny Home for her primary residence. The home is being constructed on a 20 foot dual axle trailer. She currently does not have land and will park her home at a relatives house.
There is an argument concerning RESPA.
Is this a RESPA loan similar to a mobile home in a park, or is it not RESPA and should be treated more like an RV loan?
Thank you in advance for your time.

Just like TRID - no DIRT - no RESPA, regardless of how you classify it..

1024.2
Federally related mortgage loan means:

(1) Any loan (other than temporary financing, such as a construction loan):

(i) That is secured by a first or subordinate lien on residential real property, including a refinancing of any secured loan on residential real property, upon which there is either: