I'm not a driver. But, when I started at UPS 8 years ago, HR told me that there would be permanent PC driver positions opening up "soon".
Fortunately, I wasn't interested because (nearly*) everyone that started around the same time or after I did, who wanted to drive, ended up moving on.
*There are a few permanent drivers that started after me. One was a recent off-the-street hire. One was supervisor who became a PC driver. And, 2 or 3 others had experience and a CDL that allowed them to move into feeders fairly quickly - within 3 months to a year.
There may be others that I am not aware of.