GM has launched hybrid models of the Chevy Silverado and GMC Sierra pickups, but you'll probably never see them. Only 700 pickups with GM’s "E-Assist" hybrid system will be built – that's 500 Silverados and 200 Sierras -- and they'll only be sold in California, only at top trim levels, and only in 2-wheel-drive models. General Motors is saying that they will monitor the market closely going forward... So, is this a test balloon? Maybe, but we'd love to see a nationwide release of a full-size hybrid pick-up.