We've been up and down Fancy Gap many times, both with our previous Ford 460 V8 powered 33' motorhome and our current Ford Triton V10 powered 34' motorhome, towing our car in both cases. Going up and down with the older coach was a bit more of a strain, requiring a lower gear going up and a heavier foot for stab braking going down than our current coach. In both cases I turned off O/D going down though, to gain additional engine braking. I've driven worse hills...