I made the mistake of driving US50 across WV this past fall. Normally, I go through WV on the interstate. This time I didn't. I was a fool.
I was pulling the Koala 21CS which is a relatively small TT with my new 2014 F150 Supercab, 4x4, HD long bed w/ 3.5L Ecoboost.
I had no trouble with power to pull the trailer. The problem was driving 30 mph on that road up those mountains that could give back strain to a snake. And then the sometimes 9% down grades.
The towhaul did what it was supposed to do. Depending on my braking, it definitely down shifted way down in order to get engine braking.
The 1st 1/3 is a piece of cake, mostly 4 lane road. But the eastern 2/3 is in rual WV, and is 2 lanes only. It might be fun driving a motorcycle, or sports car during the day. But I was going through pulling a TT and it was dark.
I will say it again, I will never do that drive again. I'll stick to interstates in WV.