I think parent wanted a citation that Super Duty trucks are typically used for work, and not for Brodozer hooning and yelling "yew" out of the window in a sleeveless shirt and with a plug of skoal. :)
For example if the owner of a construction company and his son have a Super Duty truck each that is mostly used to commute I would not consider them to be used as business vehicles.
For example in my country the stereotipycal vehicle for construction workers and farmers looks like [0] and exists in dozens of variations with all kinds of specialized attachments like
https://photo.static-viamobilis.com/32/1/7945049-photo-camio...
https://www.ricciato.com/resources/product/10519/gallery/05_...
https://photo.via-mobilis.com/32/2/2312573-camion-benne.jpg
https://www.grupposcotti.it/media/8d879ce9c03e93b/gamma-ivec...
https://www.ricciato.com/resources/product/10519/gallery/IMG...
https://autoline24.it/img/s/veicolo-commerciale-furgone-auto...
[0] https://www.emacchinari.com/img/19/09/231031P_20190730_09522...
https://www.pahomepage.com/wp-content/uploads/sites/91/2022/...
https://www.comerconstruction.com/wp-content/uploads/2018/08...
https://cdn.ironpla.net/i/3540/785/f6b151d7-c39c-4167-b128-4...
https://hendersonshauling.com/wp-content/uploads/2022/09/uha...
https://live.staticflickr.com/3872/15073330941_bab304b041_h....
> and exists in dozens of variations with all kinds of specialized attachments
As does the Super Duty.
https://www.fordpro.com/en-us/fleet-vehicles/chassis-cab/
While you can purchase a superduty in a non-fleet configuration through non-fleet retail channels, the article I posted above is speaking specifically about fleet sales.