"0" (zero) or "O" (Oh) = Land Yacht package
"I" (eye) or "1" (one) = International package
The International package had a few extra bells & whistles.
There is a very old document still floating around the internet that states the "0" or "O" stands for Overlander which was a 26' Airstream (available in both the Land Yacht
versions). It is wrong and keeps being perpetuated as it is impossible to purge it from the internet.
I concur with MB's assessment of what your trailer is based on the posted VIN #:
0 or O = Land Yacht package
23 = 23' long (Safari)
T = twin beds
9 = built in 1969
J = built in Jackson Center, Ohio
130 = sequential number