All the commercially and privately operating vehicles, having a gross vehicle weight of 26,000 pounds or more, and/or have 3 or more than 3 operating axles in their vehicles, traveling within the state of Oregon are required to get the Oregon Permit and pay the Oregon Highway Use Tax. And you might also have to apply for the Oregon Weight-Distance Tax or Oregon WDT if you are operating within the Oregon State and have a vehicle weighing more than 80,000 pounds.
The for-hire vehicles operating within Oregon also have to register with the Oregon Interstate Motor Carrier Authority.
If your trucking company is registered in the State of Oregon, and you are traveling out of the state for commercial purposes, then must apply for a USDOT Number and an IFTA or IRP license plate. But only if your vehicle weighs more than 10,000 pounds or has more than 3 axles, otherwise not.