"Sport Truck," or ST, is just a placeholder. It's the generic name for the El Camino-style 2010 Pontiac G8  variant based off the Holden Ute. GM is holding an online contest at www.pontiac.com/namethiscar to pick a name. The result will be announced on April 15.
It could've been Caballero, after the late-1960s/early-1970s GMC version of the Chevy El Camino. It wasn't the cost of a new nose that made GM pick Pontiac over GMC. It was, to quote product manager Brian Shipman, because of the Ute's sportiness, and "it probably wasn't the best fit for 'Professional Grade.'" The two-door, he says, is a better fit for Pontiac

2010 pontiac g8 sport truck