Driving the 89 Jimmy to the beach tomorrow, 200 miles. Bringing my buddy's 15ft aluminum Jon boat. Boat/trailer combo weighs probably at most 1000-1200 pounds. Would it be safe to tow this amount in OD? Half of the trip is 70mph zone on the interstate so I would like to be in OD if possible. My truck has the tow package and has an external trans cooler in front of the radiator. My trans has been great so far and I don't want to mess it up but really don't want to make the whole trip in 3rd going that fast. What do y'all think?