Haul a load of furniture to BelleFouche SD fro eastern ND and back again. Been all over ND and SD with the rigs. 318 3.55 gear. Most people over drive the rigs and forget that they have a load behind them and get themselves into trouble. Give yourself room and drive accordingly. No different pulling a 10000 lb load with a 6-6500 lb 3/4 ton than 6500 lb load with the 5000 lb 1/2 ton rated trucks. Or many cars towing Airstreams back in the day.
Just because the speed limit is 75 doesn't mean you have to drive that fast. I drive 55-60 and feel comfortable there.