I just bought a 66 tradewind. I liked it because it was the smallest, oldest tandem that came with the plastic tanks. (I was afraid to find the damage that would have occoured over time with the galvanized ones.) Actually, I was looking for a overlander around the same time period. I liked the kitchen and the living area a little more, but for a price of
1500 I took the tradewind.
My friend towed it home for me for about 30 miles. It bounced a lot, but I'm sure I can solve that problem later. The claimed dry weight is around 4100. From what I have heard it is easy to get 600 more before water and food is added. With a weight limit of 5000 pounds on my Four Runner a new truck is also in the picture or maybe a 62 impala. Yes, you should consider this before you go shopping for an old airstream.
Good Luck