You can drive in Oregon using your valid trip permit from another state. You must keep proof of insurance in the vehicle.
Trip permits must be obtained PRIOR to operation. Motor carriers need this permit if:
Note: The truck driver must have the Registration or Cab Card for information.
Cost: $43 fee for 10 consecutive days.
A permit is required for trailers which are not registered already.
Allows the use of unregistered:
Cost: $10 fee for 10 consecutive days.
Motor carriers are issued this permit when:
Note: The max number of Temporary passes for an account is five or more for one unit or 35 in a rolling 12 month period.
This credential is issued to temporarily increase Commercial or Apportioned registration weight of a vehicle for a period of ten days.
The following uses for this credential are decided on a case by case basis.
Source of information: https://www.oregon.gov/odot/dmv/pages/vehicle/trippermit.aspx