The specs on the TT and the Expedition would indicate max tow capacity is between 8700 and 9200, depending on the model. And the 5.4 engine at 310 hp makes that SUv probably the lowest powered of the big boys. We just got DW her fourth one last week, so I can say from experience you'd be making a big mistake going with that combination. And while some of the half ton owners pull that weight, I wouldn't care to have my family riding so close to the margins. But maybe others have a different comfort level.