X2 on a number of points made above.
IMO you do not want to tow a 29 ft trailer over the Duraven Pass between Tower and Canyon. Steep and curvy.
The easiest way to Fishing Bridge from Glacier is route 191 from I90 to West Yellowstone. From the West Entrance go to Madison, up to Norris, across to Canyon and down to Fishing Bridge.
From Fishing Bridge south to West Thumb and on through the South Entrance to Grand Teton will be no problem. All the roads in grand Teton are in the Jackson Hole Valley between the mountains, so are an easy drive.
Many folks do the Badlands as a 1/2 day drive through. In the summer the Badlands are hot and there is no shade. Also, the Badlands will seem tame after seeing Glacier, Yellowstone and Grand Teton. An extra day at Yellowstone would be much better than an extra day in the Badlands.
Just curious, what route were you planning to get from Grand Teton to the Badlands?
