First of all, as has already been stated Troopers could care less about RV's. They are checking commercial truck traffic for overweight and safety violations.
Secondly, if they would investigate you for being overweight (which I don't think they ever would), the first thing they would check would be what weight your actual registration allowed, and each state is probably different.
It would have to be some type of fatal crash before an attempt to weigh an RV would be anything included in an investigation by a Trooper. And the only way the DOT or Commercial Truck Enforcement folks would be involved would be if a commercial vehicle was somehow involved.
But really all RVers should weigh their rigs, know their limits, and try to stay at, or below them for everyone's safety.
