130 miles of gravel/chip seal, rough. You should be ok.
If it's a rental Class C check your paperwork, almost every rental agency in AK prohibits specific roads. The Denali Hwy is one of those specifically listed.
The Denali Hwy has a couple lodges and one tire shop, not sure the tire shop is still open. There are no other businesses on the Denali Hwy. Take a spare tire if you go.
Fun drive, made it several times when I still lived in AK
US Navy Vet, Liberty Tree Member of Oath Keepers, NRA & VFW Life Member, Alaska EMT.
2009 Safari Cheetah 40 SKQ
2009 Winnebago Chalet 231CR