The Trekker was produced from early 1981 through 1983. The Trekkers were all built on the short wheelbase Hilux chassis. All of the Trekkers were classified as SR5 by both Winnebago and Toyota, regardless of the actual VIN denotation. Originally there were to be a SR5 and Deluxe version of the Trekker, one with vented windows and one without. All 1981 Trekkers had vented canopy windows. Non-vented canopy windows were not installed on the Trekker until the 1982 model year. Unvented windows were installed due to leaking issues of a forward facing vent on the 1981 Trekkers canopy windows rather than the equipment level.