Very common. Had one slam into me up in st.louis and do almost 30k in damage to my rig then just drive away. Even if your company has dashcams, get your own and a high quality one. Also always inspect your truck before you get back in if you left it unattended for any length of time in a public place.
Don't believe every story you hear. DO HAVE A DASH CAM. If in doubt, report any damage to the company if you didn't do it until they tell you to stop reporting every scrape and dent. Never add any scrapes or dents to any equipment. NOT EVEN LITTLE ONES THAT NOBODY SAW YOU MAKE.