I've towed Monarch and Eisenhower/Vale Pass a few times. A proper setup on I-70 with good weather and mountain driving experience I'd put at Pucker Level 2; Monarch a 3, 4 at night. All bets off if weather hits. Just my subjective opinion.
70 is ranked one of the most beautiful Interstate drives in the country. 50 is very good condition, or was last time I drove it.
Personally I don't give much thought to pulling power in mountains. The down hill side is the skill builder. The runaway ramps are on that side for a reason.
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'11 Eagle 320RLDS
'02 F350 PSD Dually 4WD
DW's Ride, '13 Expedition
'14 Denali XL
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