Thanks for the useful links.Truck driver is classified as NOC C so not classed as a high skilled job for PR purposes
http://noc.esdc.gc.ca/English/noc/Profile.aspx?val=7&val1=7511&ver=16&_ga=2.185468969.1082023109.1528691875-761034813.1528691875
You will need to find a skilled job yourself classified as A,B, 0 yourself so you need to find a job role with that classification in the link below.
https://www.canada.ca/en/immigration-refugees-citizenship/services/immigrate-canada/express-entry/become-candidate/eligibility/find-national-occupation-code.html
I don't understand that he is eligible for PR or not? On the basis of heavy vehicle driver.