You may already be doing this, but I suggest that you keep your speed as constant as possible,if necessary,accelerate at the easiest points possible (smallest inclines) , minimize braking, take turns wide when safe, and make all passengers get out and walk up the hill. Ha ha! Or have you tried taking Old Hwy 30 (Old Rainier Rd) to Meserve Rd? It's a bit further,but it looks less steep on the map.
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