Thanks everyone!! 
Yes only the slip will expire, the license card will be posted to me and that remains valid but then you have to renew it on a yearly basis on H2a Visa. In other words it will say valid till 1 Dec because then my Visa expires but next year I do just the eye test at DMV centre and then pay 41usd and get another one valid for the new year 
Met ander woorde dis n soort PDP wat jy nou gekry het? 
CDL is "Commercial drivers licence' and class A is similar to code 14 in SA.
They do not except SA licence for commercial driving.
Then you can do add ons like: School bus and Hazmat but need to be a citizen
I can do doubles and triples as well as tanker vehicle endorsement but that is just a test on the DMV computer and easy
I have studied it but no need to go through the extra cost since I only need tractor and trailer (horse and trailer)
It is big in America Chris wrt safety and has changed a lot recently for added safety and awareness
Easiest way is to go through a Cdl school but that is 3 weeks and a LOT of money.
Groete