The new 2009 Hummer H3T Details and Reviews The Hummer H3T is built on the Chevrolet Colorado/H3 architecture. Although based on the SUV, the H3T’s wheelbase is 8,6 cm larger, reaching 3,41 m and allowing the presence of a pretty reasonable separate bed, with 1,5 m. The crew cab ca carry up to five passengers. Engine options range from a Vortec 3.7L I-5 with dual overhead cams and variable valve