Greetings and welcome to these Airstream Forums. You have mentioned all the right things in preparation for your "recovery' mission. You will find new trailer tires easy to find, there is nothing unusual about them. Expect to pay maybe 150 each. Inspecting and testing the brakes is a must, and packing the wheel bearings at the same time is good to do. Testing all the exterior lights is a must: tail, turn, brake, and marker lights. Inspect the coupler and your planned hitch as well. Plan to bring emergency items like a jack and wrench for changing a flat, and hand tools just in case.
Safe travels around the fires.
WBCCI #8607 VAC Region 11
KnowledgeBase trailer renovation threads: 69 Globetrotter, 76 Sovereign, 75 Overlander, 66 Trade Wind Such fun !