Welcome from Colorado, formally from Minnesota. And welcome to the vintage Airstream hobby. I renovated a 66 Trade Wind 24' some years ago. It was dual axle, and I'm not sure when Airstream made them standard. Mine had the same "sink over tub" fiberglass bath design as your trailer has. I traded mine for a 75 Overlander 27' and renovated that one too. I enjoy working on these old Airstreams.
These Forums are full of information about your 64 Trade Wind. Let me link you to the Knowledgebase, Airstream Trailer Forums, Tradewind, and your year range. It is found near the bottom of the Forums page. Start reading and learn all about the particulars of your trailer. Yours has those nifty big windows on both sides of the front room.
Here is a link to the Vintage Airstream Resource and then photos of the 64 Airstream. You might like seeing them.
Post some photos when you get a chance. You might enjoy starting a "project thread" in the Airstream Trailer Forums about your trailer. Others like me enjoy reading along with your project and offering lots of free advice. Oh boy, can't beat that.
WBCCI #8607 VAC Region 11
KnowledgeBase trailer renovation threads: 69 Globetrotter, 76 Sovereign, 75 Overlander, 66 Trade Wind Such fun !