Hallmark Manufacturing Inc. (Hallmark RV) is a family-owned builder of lightweight, low-profile pop-up slide-in truck campers based in Fort Lupton, Colorado. With roots in the 1950s and a 30,000-square-foot facility, the company emphasizes composite construction to meet the demands of off-road, overland, and off-grid travel.

Notable models include the Milner, Guanella, Cuchara, Everest, Nevada Side-Entry, Victor, Ute XL 8.5, and Milner S6. These pop-up truck campers are recognized for quality and durability, with prices ranging from $53,995 to $86,995 and dry weights from 1,212 lbs to 1,893 lbs, featuring fiberglass construction.