It depends on the truck and the stae. Generally if you have a 6+ wheeler with a heavy weight it must be weighed in weigh stops.
Not for scales exclusively for commercial trucks, although some states may require you to go through ports of entry. RVs are ridiculously under regulated in the United States.
Either because the scales are full, and not accepting anymore inbound trucks until they have space available again, or else because the trucks are equipped with a Pre-Pass unit.
Most probably, their scales is like our skin. They breathe through their gills not their scales.
Often you can tell what family of fish it is in.
snakes. The body of the snakes are covered with scales and breathe through lungs
Crystalina Scales goes by Crystalina.
Mark Scales goes by Halibut.
Prunella Scales goes by Pru.
Darren Scales goes by Daz.
Check out the website truckscales.com. They offer scales for all sorts of trucks, no matter if they are big or small. There is a contact page on their website.
Virgil Trucks went by Fire.
If you have access to the internet you can find the nearest dealership through their website. Go to http://www.navistar.com/Trucks/Find+a+Dealer and enter your location. There are several International Trucks dealership located in the country. If you visit www.navistar.com you can find the one closes to you.