A passenger car over 4,000lb isn’t subject to weighted tags because doesn’t meet the statutory definition of property hauling vehicle. Pickups still don’t stop at weigh stations. Maybe hotshot truckers subject to ICC, but not the just hauling stuff individuals and contractor types. Unless they see something they think is wrong with you’re rig, like the tires are squatted bad or you tied your tractor down with 1” straps or something they probably aren’t going to mess with you. If you’re running a “First in Flight” car type tag pulling a 20’ trailer, you’re likely to get stopped and weighed on the side of the road. If you’re sporting a weighted tag (which looks a LOT different from the standard car tag even from 100 yards), you’re probably not getting stopped. And they do cost more. I’m not looking at the precise numbers but as best I recall the annual tag fee for a car is about $75. My 16k tag runs I think around $350. I know it’s between $300 and $400.
My biggest issue with rolling the dice on getting stopped was as soon as I hooked my little cargo trailer to my Tundra every cop and DMV officer knew I was over the 4K limit even if all empty so I would be a sitting duck with a 4K tag. Without the trailer they’d probably leave me be in a Tundra or any other half ton. And it isn’t just the fines. They aren’t that bad. What is bad is if I’m 2 hours out, couple more to go, and my rig is sitting at a stop, out of service until I can get a ride to a DMV office to pay the fine and get the right tag to get the out of service order removed. I don’t want any part of that.
At least in the area I live, they will stop people hauling equipment and weigh them, particularly if you aren’t sporting signage for some big company they know is likely to have their stuff in order. Not to the level of harassment, but they’ll stop you.
Recently saw a guy with a jacked up, tricked out Dodge 4WD diesel dually pulling a bulldozer (about current D4 size) on a trailer that would have looked more at home behind a tandem dump truck down I-85 early on a Sunday morning. DMV officer and a Highway Patrolman had him pulled over and looked like they were having a great time together.
Have seen several guys with skidsteers, mini-ex’s, and tractors getting weighed. Didn’t used to be like that but times change and pickup tow capacity has as well. I may not like the law, but I don’t care to be that guy getting shut down by DMV, so I pay for the right tag.