1985 Airsteam TTs had a RM 1303 3-way fridge as standard
https://www.airstream.com/owners/document-archive/product/tt/year/1985/http://bryantrv.com/docs2/docs/rm1303.pdfEDIT--using that link above, I went back as far as 1971 and they had "gas/electric combination" fridges as standard. Don't know the model for the fridge.
EDIT--the 1982s still say gas/electric combo, the 1983 says RM100.
seems to be a 3-way that uses 12v
http://bryantrv.com/docs2/docs/rm100parts.pdfRef here to a 1976 RM100 in an Airstream
https://www.airforums.com/forums/f425/1976-dometic-rm100-no-cooling-l-kie-what-i-found-106531.htmlSo that is 1976 for a "gas/electric combo" that was an RM 100 that does need 12v. Still don't have when that "modern" type of fridge started being made for Rvs
