I live in one of the most rural states in the country, where loads to haul are generally large and the posted speed limit on the highway is usually 75 mph, and the de facto highway speed is usually 5-10 mph above that. No truck that can barely push 70 is gonna keep up with that. On top of that, you’re dealing with ice and snow on the roads half the year, so you’ll need to be able to deal with that too.