Ok - this has probably been discussed before - but for my info - considering the Interstate system only - what's the steepest highway grade/worst hill to pull that you've experienced. One of the steepest I can think of is Cabbage or Emigrant Hill Just East of Pendleton Oregon - about 9 miles of 6% Interstate with some very sharp curves, but the view on a clear day looking west - hard to beat - one can see Mt Hood and Mt Adams over 100 miles away. You know what sort of truck you have pulling Cabbage Hill in the summer - and the winter - well that's another story altogether.