I run 30k in my pick up and about 50k in my Pete every year.
My uncle retired after 40+ years behind the wheel and when asked how many miles he ran he says 3-4 million. Back in the day he would run 24 hours then sleep for 8-10 hrs and back at it.
I have a cousin who currently drives full time and easily gets 125-150K miles a year. He started driving young. He'll have 40 years in before long. It's possible to run 6-700 miles a day for 6-7 days a week, legally. He tracks his miles by the trucks he's worn out. He's well over 2 million miles and counting.
I knew some full time team drivers getting upwards of 300K miles per year.
I ran UPS freight from Dallas to LA during the holiday rush years ago. That was about 3100 miles. We would leave early Monday am and be back Wednesday afternoon, drop and hook, Take 8 hours off and do it again. Co driver and I would run about 25000 miles between Thanksgiving and Christmas.
It's very possible and pretty common.