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Tiny Houses are defined as House Trailers in Hawaii

Statewide Traffic Code:
http://www.capitol.hawaii.gov/hrscurrent/vol05_ch0261-0319/hrs0291c/HRS_0291C-.htm

PART I. GENERAL PROVISIONS
§291C-1 Definitions.
“House trailer” means:
(1) A trailer or semitrailer which is designed, constructed, and equipped as a dwelling place, living abode, or sleeping place (either permanently or temporarily) and is equipped for use as a conveyance on streets and highways; or
(2) A trailer or a semitrailer whose chassis and exterior shell is designed and constructed for use as a house trailer, as defined in paragraph (1), but which is used instead permanently or temporarily for the advertising, sales, display, or promotion of merchandise or services, or for any other commercial purpose except the transportation of property for hire or the transportation of property for distribution by a private carrier.

[note: permission to live inside a "house trailer" on private property with permission of the property owner is authorized by this state vehicle code. §291C-1 (1) and (2) above]

PART XII. MISCELLANEOUS RULES
§291C-126 Riding in house trailers. No person or persons shall occupy a house trailer while it is being moved upon a public highway. [L 1971, c 150, pt of §1]

PART XI. STOPPING, STANDING AND PARKING
§291C-113 Ordinances regulating use of vehicles for purposes of human habitation. Each of the counties may enact and enforce ordinances regulating the use of vehicles for purposes of human habitation. Upon each of the counties enacting an ordinance pertaining to the use of vehicles for purposes of human habitation, then so far as that county is concerned, the ordinance shall have full force and effect, and shall supersede section 291C-112 until the ordinance is repealed or otherwise made invalid. [L 1972, c 48, pt of §2]