Dear Mel,
I have several trailers. Airstreams, utility and equipment trailer to haul the tractor on. To me it is MOST important to be wired to current code. I had my Suburban all wired to code and then changed the wiring on my 1962 Bambi to match. This I feel is important so any trailer, including friends "brand X" trailers will now all work proper off my tow rig. Also if I ever have a break down on the road,(heaven forbid) some one could take another rig and tow my own Bambi into port.
I think I do have the original wiring diagram for the 62 if you are still interested. As far as I am concerned it is obsolete.
Sincerely,
Pat Ewing