The factory puts a plastic insert in the camber cam to hold it in stock position, and I’ve seen those stay put for a long, long time. Once the plastic insert is removed, however, I’ve had the camber re-adjust itself (bumps, hard braking) and then you’re troubleshooting front end wobbles and shakes. I was on a road trip last Christmas when this happened to me, so a got a cheap camber tool that helped get me back on the road.
YIQI Adjustable Magnetic Gauge Tool Camber Gauge Castor Strut Wheel Alignment for Car Truck
https://a.co/d/gPyY6ss
Checking the toe isn’t hard either, and after rebuilding my 99 Burb’s front end I aligned it with a level, string and a tape measure. When I took it in for alignment it was balls on. I had marked everything too, but just counting threads on the new tie rods turned out to leave the toe out of spec. Plenty of diy alignment youtubes if you are so inclined.