Don
If you're 20 lbs over a rating per say, the change that an LEO/CVEO will cite with an over wieght ticket is slim and none, assuming you using the RA numbers mentioned. I've been upwards of 50% over and NOT been given over wieght tickets.
You have to stay under federal bridge law amounts, which is probably 9500-11000 lbs per axle on your truck. Or if majorally over your paid for amount. Even at that, as has happened to me, I got a 10 day raise gvw up 2000 lbs. $15-20 here in Wa St. I was 1200 over paid for total.
As I said earlier in a joke to a degree, the answer to OP, your example, clear as mud!
Do you follow warranty/performance rating? Or legal rating per FBL. If on follows warranty ratings, you'll never be over wieght from a legal standpoint.
Marty