The buses were not any Greyhound class.
Prevost high dollar buses and well cared for.
Yellow had two of these outfits. One was used for George Powell to visit his terminals on a yearly summer tour.
Had a Teamster bid driver.
The other was used to take customers to events and entertain.
Their was also a clean GMC Astro with a trailer behind full of safety swag and information.
This was back when GP ran the company and made money.
Last I saw of the buses was right after GP turned the company over to his kid. Early 90s