Around 1999 the regs were changed to require that the adjusting regulator must be outside the cab where the driver cannot access it while driving.
On dump trucks, the up - down switch is permitted to be in the cab obviously so the driver can lift the axle(s) when necessary while driving. The gauge can also be in the cab, or can be located at the regulators outside the cab.
On the dump trucks we set up at work, we put the regulators under the hood on the firewall.
The regs were changed apparently to prevent drivers from changing the pressure on their axles just prior to driving on to a scale for a DOT check.
Also, I believe that all controls for a lift axle on a spread axle trailer must be outside the cab
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If you can't shift it smoothly, you shouldn't be driving it.
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