Anyone had their rig weighed by authorities in these areas?

I have lived in South Dakota all my life, and drove truck based here for 17 years. I have NEVER seen an RV at a scale. That was going through 36 states.

Here in SD, the scales specifically state that RVs are exempt from weighing.

Edit: I have never been in an accident with one of our campers, but tourism is our second largest "industry". They want people to come here.