pulling a 29ft travel trailer with a 2010 avalanche??

We tow our 28' TT with the Avalanche. I was concerned at first, moving up from a much lighter 24' TT. But things have been okay. I tried to keep the loaded weight as light as possible, by eliminating about half the cargo and gear that we had in the old trailer. We really haven't towed in mountainous terrain, nor do we plan to. the new TT actually tracks and maneuvers better than the old TT.