Practically nil.
Remember, a straight truck is an extremely large investment. An owner is going to want to have the truck moving as often as possible. If a load is turned down due to the driver being out of hours, the truck isn't generating any money for the owner.
R.i.p Doris
On June 9th, TCM will have a Doris Day marathon
http://www.tcm.com/this-month/movie-news.html?id=1488361&name=TCM-Remembers-Doris-Day-1922-2019-
Ragmama has pre-programmed the dvr. Whoopie!