It's here in CA but not yet stated on signage. I've started to see the term " rental trucks" but nothing related to lbs. A truck owner is required to fill out a declaration of GVW and CGW upon registration. If over 10,000 lbs, the front license plate carries the current year with the small corner sticker and your declared weight is posted typically on the door with another yearly registration sticker.
I was able to enter a small set of scales and talk to the officer at the desk. He never took his eyes off the monitor while looking upstream at his video streaming trucks of all size entering and yes....bypassing. This area is common for doing a sting probably monthly.