As far as I know they are still hanging in there, not sure for how long though.
They changed their corporate name and the name on their trailers to DRV this past summer due to federal legislation governing trademark law. DoubleTree is the name of a hotel chain that was purchased by Hilton Hotels and to avoid any possibility of future conflict and to make its brands entirely distinct and easy to recognize, they changed to DRV.
'11 GMC Acadia SLT AWD
'11 GMC Sierra 1500 4x4 Extended Cab