I think overall I've had good luck with my V10. I usually sit around 18,000 when traveling (including the toad) and the only issue I had was loss of power at higher altitude. I had a turbo with almost no extra boost added to the RV. It sits on the tail pipe under the coach and feeds back up to the air box. Makes almost no difference to the RV at lower altitude, but makes it much easier to keep highway speeds when going up the mountains while fully loaded. When I was running without the car behind (5,000 lbs less to haul) I didn't feel the need for a way to get more power out of it.