How fast do you go

Cummins12V98 wrote:
"Max is 60 mph here in Wa st no matter where you are in the state if you have a gvw over 10K or are pulling a trailer."

Marty do you have something to back that up? It that actually posted somewhere or just a hidden law?

I have lived there all my life and have never seen anything other than "Trucks" limited to 60. I have seen there are weight limits to using the HOV lanes.

I have never seen any signs like this either. Only ones about staying out of the left lane on 3-lane freeways.
https://app.leg.wa.gov/rcw/default.aspx?cite=46.61.410

RCW 46.61.410 wrote:
(2) The maximum speed limit for vehicles over ten thousand pounds gross weight and vehicles in combination except auto stages shall not exceed sixty miles per hour and may be established at a lower limit by the secretary as provided in RCW 46.61.405.

“Auto stages” are pretty much Greyhound busses:
https://app.leg.wa.gov/RCW/default.aspx?cite=46.04.050