I have never been stopped in NC pulling trailers and large campers. I always was ready to beg for forgiveness if pulled.
I was with some friends several years ago going to Michigan, I beleive it was in Ohio but I was not driving, and they pulled all three rigs. All received citations for failing to stop at the weight station and for not having inspections on the trailer. I had never heard of trailer inspections at the time.
Many trailer vendors promote trailers with weight stickers less than 10,000 pounds, say 9,999, so they get around the rules. I think many east coast states have similar rules. Georgia has several enclosed trailer manufacturing facilities that market 9,999 pound trailers as an example.
While stickly hearsay, I believe in NC the rules for commercial apply if over 10,000 pounds regardless if indiviually owned. I think you need to buy commercial or weighted tags if the trailer is rated over 10,000 pounds. We always purchased those tags for our tow trucks.
But I really don't know for certain. Let's see what the response is from the person that called NCDMV.