According to the CO map, North Pass is at 10149' with a6% grade, Monarch 11312 , 6.4%, so North may be better for you. I've not been over North, but have been e to w on Monarch, and didn't feel it was incredibly challenging with my set up. As they say, your mileage may vary. Happy trails!
Jayco Designer 30 RKS Medallion pkg, Trail Air pin
'05 F350 6.0 PSD CC 4x4 DRW LB B&W Companion, Edge Insight
“Certainly, travel is more than the seeing of sights; it is a change that goes on, deep and permanent, in the ideas of living." Miriam Beard