Originally Posted by Jezibels
I found a 1966
Safari and might need to buy it ,
Need to know the plug size on trailer (mine is a 6 round) and ball size?
The original hitch on a 1966
Safari would have been a Marvel 2" coupler. The required 2" hitch ball should have a minimum 6,000 pound rating. This is not a mass merchandiser type product, it is usually necessary to go to either a full-line auto parts store or a trailer dealer (not necessarily Airstream. This does not account for the possibility that a previous owner may have change the coupler to a more modern unit with a different size ball requirement.
You will need a seven pole connector for this coach. Originally, the coach was wired to a schematic unique to Airstream that can be found in this link
(check out page 2). Today, there is an industry standard wiring schematic that does not match so you will likely need to make an adjustment to either the tow vehicle or Airstream -- this wiring schematic can be found in the following link
The original trailer connector end would have been a seven pin-type connector similar to the one seen below:
The matching tow vehicle end would look like the following:
While not typical for the RV industry today, this type of connector is said to be much more corrosion resistant than the blade-type connector. Over the years, I have had so much trouble with the blade-type connectors that I switched to these pin-type connectors at the beginnin of this season.
The more typical RV trailer end can be seen in the photo below:
The matching tow vehicle end can be seen below:
If you need information about trailer weight or hitch height, you can find that information in this link
Good luck with your investigation!