You can get oversize/overweight permits from Motor Carrier services. If not, order the permit online through a permitting service with some additional charge or mail the permit application to the below address.

Commercial Permits

Arizona Department of Transportation

1225 N 25th Ave
Phoenix AZ 85009-3601
or at Port and Commercial Permit Locations.

Refer: https://www.azdot.gov/motor-vehicles/enforcement/commercial-vehicle-permits/general-permit-information/oversize-overweight-permits for more details.