>>520605149
>American trucks are regulated by the trailer alone.
Sort of.
It's regulated by weight per axle.
80,000 lbs max for the entire vehicle.
20,000 lbs max for the tractor's front (single) axle
34,000 lbs max for the tractor's drive (tandem) axles (i.e. front of trailer)
34,000 lbs max for the trailer's (tandem) axles (i.e. rear of trailer)
But you can adjust the trailer's axles forwards or backwards, if one set of tandem axles is too heavy.
34,000 max for