>Even wider scope, a child who "qualified moved" within the last 36 months is considered migratory i.e. homeless.
This is what the definition of migratory child is.
(3) MIGRATORY CHILD.—The term ‘‘migratory child’’ means a child or youth who made a qualifying move in the preceding 36 months—
(A) as a migratory agricultural worker or a migratory fisher; or
(B) with, or to join, a parent or spouse who is a migratory agricultural worker or a migratory fisher.
It's not just that they moved (which is what I read from your comment) but they are a child who's parents are migratory workers and moved within 36 months.
>For example if you live in a trailer park, you are considered homeless.
This seems to check out. It's odd in the rest of the definition.
>(i) children and youths who are sharing the housing of other persons due to loss of housing, economic hardship, or a similar reason; are living in motels, hotels, trailer parks, or camping grounds due to the lack of alternative adequate accommodations; are living in emergency or transitional shelters; or are abandoned in hospitals;*