I know SAF is quite strict in enforcing traffic rules, and since
you say you drive a 3 tonner, then it pays to wait for a while.
Better wait behind, than to do a dangerous overtaking stunt. You
might have just signed your way to DB!
But having said that, if the car stops completely, and driver has
no intention of moving his car at all for prolonged periods, then
it make sense to overtake!