Steepest grade I've been on (with my class C) was Rt22 out of Jackson, Wyoming a 10% grade. The old V10 was revved up and I was lucky to keep it at 25mph, worried about holding up traffic behind me going up hill, until I saw the truck behind me widening the gap. He was having a tough time doing 20mph. Downhill in first gear was not fun either, but we made it with no problem.
Bob
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