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No, weigh stations are for commercial cargo vehicles.
If requested to do so
Interstate weigh stations require any large truck to stop at the stations when they are open and active. A dump truck qualifies as a large truck that would need to stop.
Some states may require it. Ports of Entry in New Mexico require rental vehicles to stop.
To weigh in to make sure that they are not overloaded (because they causes more stress on the roads sometimes in towns at stop lights and stuff you can see the grooves in the tarmack were the trucks come through alot)
Some states do require it. Some states require all rental vehicles to stop at ports of entry (New Mexico is one).
If they would be considered a CMV without the farm plates, yes.
In most states, no. However, some states may require commercial vehicles with a GVWR of as little as 8000 lbs. to stop at weigh stations.
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The majority of weights at weigh stations are permanently installed in the pavement. They are below the asphalt, and not portable at all.
Most bathrooms do not have baby changing stations, although those in gas stations and fast food restaurants along busy highway exits usually have these stations.
Official weigh stations are operated by the highway department for the enforcement of laws relating to maximum load limits and have no services available to the general public. (It's a bit like asking if you can buy donuts at a police station.) However, it's not uncommon for "truck stop" type service stations to have unofficial scales for drivers to check their load to make sure they're within the legal load limit.