One key note on the maintenance- many of the newer trucks are running 20,000 and even up to 50,000 miles between oil changes! The air shift auto shifting 10 and 13 speed Eaton transmissions have no clutch and drive much like an automatic transmission vehicle with the only difference being that the computer "defuels" when it shifts much as you would if you were shifting a manual trans yourself. This is the best of both worlds- manual trans reliability and auto shifting ease for the driver. We have one of these in one of our tractor trailers at work and while the "real" truck drivers don't like it, the driver who drives it every day goes home without a sore left leg every day. I hope to someday NEED a HDT or MDT....and then I'll just HAVE to get one!