we just crossed over Wolf Creek pass in colo. The V10 got as low as 25MPH, BUT, we still were able to PASS a NEW Dodge that was struggling to make it over! Dont know what his problem was but he eventually pulled in behind us at the crest. Left before we did but he was stopped again just down the road!
I pulled it last year with MY 6.0 ford no issues. Yes, he had a 32-35 5th wheel in tow, I was in our new to us 29 ft MH with a towd.