If you get a truck you can't go wrong with a diesel both the dodges and ford diesel have weak transmissions. I haven't owned a cummins but they are like the sbc of diesels my powerstroke has 270k miles and I haven't had to due to much other then a sensor and get my trans rebuilt, also got 19mpg pulling a trailer back from NC. Best thing to say is research and go out and test drive to see wich one you like better.