Wheels to pull the drums. Required to pull at least 2 wheels to inspect. They must check the boxes of which 2 wheels they pulled on the back of the sticker. It's a antiquated law that provides little to no safety benefit. The required drive and light and tire check is way more effective in finding a problem, while being less invasive. I fix all my vehicles myself, if it were not for pa. inspection a mechanic would never touch my cars.
My Kenworth and semi-trailer have a less intrusive inspection requirements. No my truck and trailer are not registered in Pa. for these reasons.
I will also add that the inspection stations get random audits which were done by state troopers who do not have to justify their jobs based on audits. Now there is a specific contracted inspection station auditors, guess what they need to find in order to prove their job is necessary? Yes, problems that are not really problems. Just more government created nonsense that cost us money, typical.