I've finally towed my new 30' travel trailer, setting the trailer brakes. Current weight is 6350 lbs. I expect another 1000 lbs with water/gear. I'm driving at 60mph over a train bridge, medium steep, and with the pedal floored in 5th gear I'm slowing down to around 52mph. I had to downshift to 4th to pick up speed. No big headwinds either. Is this normal? With an 11,900 lbs towing capacity, I would have thought my half load wouldn't have slowed it down at all. What do you experienced folks think?