My wife will be heading up to Korat by bus then renting a car to drive on a few hours. I’m looking for a recommendation for a decent hotel that she can possibly walk to from the bus station and any recommended rental car companies. TIA 

Try using Agoda...

Try this:

https://www.booking.com/landmark/th/nakhon-ratchasima-bus-terminal-2.html

Change suites, just up the mittrathap road.