Welcome from a neighbor up north. Gee, 70 mph towing takes more fuel than my 65 mph. I can do even better at 60 mph. I guess I'm too old to be in a hurry.
We just visited your state a couple of weeks ago. We had to wait out a windstorm for a day. They forecasted gusts as high as 70 mph in southern New Mexico. That would blow me off the road.
Welcome to the vintage Airstream hobby. Your need to post a photo of your 72
Sovereign. I'd like to see the thing. I wonder if it has been renovated, or are you going to dive into it?
I bought a 75 Overlander last fall. I've been working on it most of the winter. I have quite a bit more to do to it to get it "travel ready". I think you will find these Forums very useful as you learn all about your 72.
David
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WBCCI #8607 VAC Region 11
KnowledgeBase trailer renovation threads: 69 Globetrotter, 76 Sovereign, 75 Overlander, 66 Trade Wind Such fun !