For the purposes of RCW 46.25.050 (1)(c), the term "recreational vehicle" shall include vehicles used exclusively for noncommercial purposes which are:

(1) Primarily designed for recreational, camping, or travel use;

(2) Towing a horse trailer; or

(3) Rental trucks having no more than two axles (one steering and one drive axle) used strictly and exclusively to transport personal possessions.