A few years back I bought a Toyota 4Runner and towed a tent trailer with it. I was planning on getting something bigger and did when we moved up to a hybrid. I stayed away from the Highlander at that time because it had a unibody versus a frame like the 4Runner. I had a friend that had a Toureg and was told that the unibody was not designed to handle a weight distributing hitch.
Since that time I have read conflicting reports of this so perhaps someone can jump in and give some up to date advice. I was not too concerned about the short wheel base of the 4Runner because I had my Equalizer hitch connected to a trailer that was well withing my limits and I was a very cautious driver. It served me well as long as I had it. Toyota makes some very dependable vehicles.