Section 2 - Application to trailers, semi-trailers, and trailer coaches(a) The provisions of this title in relation to registration, certificates of registration, refund of registration fees, duplicates of certificates of registration and number plates, and times of registration and transfers of registration and the duration thereof, for motor vehicles shall apply also to trailers and semi-trailers.(b) The provisions of this title applicable to motor vehicles, trailers, and semi-trailers shall be applicable to trailer coaches unless otherwise specifically provided or clearly inapplicable.