Axle weight limits on 4 axles (theory)

Put a 20k lb steer axle in the truck?

Spread axles on the trailer?

 

Ours were 42 k max on the drives,4 axle tractor ,2 drives and 1 pusher axle.This was not on an interstate though,highways in Alaska.But that's what we could do for the bridge laws.
16 axles and 162,000 gvw.
Rand Mcnally book would probably have good information.

 

20k steer axle,we were always about 14.5k on the steers.

 

Registering over does get you around any "over gross" citations, but not "over axle" citations. Other than heavier steer and a spread, the only legal way I;'m aware of is individual overweight permits where issued.

 

Many states permit steer loads greater than 12k, depending on the tire width. European trucks have several width standards; 295mm through 495mm, with around 325mm being standard. Last time I checked, or common 295mm US steers would allow you 14k in many states.

As for the trailer axles, if the spread distance between them is increased, you can haul a heavier load. With a 10' spread, you can haul 20k on each. Or with close-spread tridem, you could haul 46k total.