Buying a tow vehicle question

Define "screaming engine". All three of those trucks with naturally aspirated V8 engines will be turning 4000-5000rpm at time in order to maintain 60mph up steep grades (or even not so steep grades). That is where each of them make peak power. While this is how these engines are designed and can reliably perform this way for 200k+ miles, some people call that screaming while others call it harmonious music. You'll need some self evaluation to determine if appropriate.

Today's half tons with forced induction will likely maintain lower engine speeds, like 2000-3000rpm where Ford's Ecoboost line and Ram's Ecodiesel make their peak torque.