We've towed numerous times up 95 from 80 into Idaho. No issues, pretty good roads, only a couple grades nothing too serious. It is my preferred route when we go to northern Idaho.
2011 Ford F250 6.7 PSD Crewcab Lariat 4x4 (timbrens)
2015 Cougar 301SAB
Sold:2002 Ford F250 PSD CrewCab Lariat 4X4 (DP Tuner, plus other goodies!)
2008 Sundance 2890BHS 5Vr
Yamaha 2400iS