Just checked the Options Code sticker -- GT4 (3.73 ratio). This means a Max. Trailer Weight of 5700# and a GCWR of 10500#. So, following the formula in the Towing Library, and changing to a smaller TT, this is what I came up with --
2004 Chevy Trailblazer LT
(4.2L 6-cyl., 3.73:1 axle ratio...