Well we had a successful trip!
Truck had no trouble at all pulling the trailer. Speed limit on most the roads I was on was 80 km and I kept the truck at around 90 km ( as no one drives speed limit around here). The route I took to get to the camp ground had us go up over a fair sized bridge, then right up a long and large hill (large enough to have a double lane for slower traffic going up). Managed to keep it going at 95 km up that hill. With overdrive turned off, the truck stayed at just around 2200 rpms while at the 80 to 90 km range. It didn't shift in and and out gears one bit. Now climbing the big hill, I had to give it more gas and it jumped to about 3500 rpms, but only for a minute or so. I would normally just stay at 80 going up that big a hill, but wanted to see how the truck would react to giving it a blast of gas.
Then on the twisty back country roads, again, no problems with handling the truck and trailer. I drove my buddy's Cadilac SUV which I think can pull 9700 lbs and his trailer is just a bit heavier than mine, and my truck and trailer felt the same way as far as bounce and pull.
We had a few small problems with the trailer that we will be taking it back to the dealer to be sorted out, but for the most part, it was a very good weekend!