Hummmm the old half vs three quarter debate again! OK, the bottom line is this
3/4 ton will get you better tires, stronger frame,wheels,axles,brakes. To get that you will also get better load carrying capacity, bigger motor, worse fuel economy, and a bit rougher ride. Unless you go with a $55K Ford ecoboost with max capacity packages you will be right at the edge with a 7000 pound trailer plus passangers and stuff. With a well equipped 3/4 ton you can bump up to a 9-10,000 pound trailer and still have room to grow. Your choice as to what is important to you. Many folks will never upgrade beyond their 6 or 7 thousald pound trailer. For them a properly equipped half ton is just fine.