R.I. Gen. Laws § 31-3-42
The administrator of the division of motor vehicles shall issue plates designated as "camper plates" to any person who shall register a travel trailer, pick-up coach, pick-up camper, motorized camper, or tent trailer. In addition, the administrator of the division of motor vehicles shall issue a registration certificate to any person registering a pick-up coach or pick-up camper, which shall be affixed to the coach or camper portion of the vehicle and for which there shall be an additional registration fee of three dollars ($3.00). The design of the certificate shall be prescribed by the administrator of the division of motor vehicles and the certificate shall be maintained in a manner and location prescribed by the administrator of the division of motor vehicles.
R.I. Gen. Laws § 31-3-42