Pennsylvania Route

We are driving a 37" diesel motorhome with tow travelling east ward from Ohio on I80 heading to Kane PA. Going toward Kane I can leave I80 at exit 60 near Clarion PA onto PA 66 or keep going to exit 80 near Brookville PA onto PA 36/899 or keep going and exit at exit 90 onto US 219 near DuBois PA. Exit 90/US 219 I'm thinking since its a US highway would be a better road to Kane but it is the longer distance of the three choices. My question is, is PA 66 or PA 36/899 suitable roads (sharp curves, large hills, blind spots, potholes) for our motorhome to be travelling on? Thanks and be safe!