Russell, Sorry I can't say if Ventura's came with a awning
originally but I would assume it was an option. Was there not a awning rail on the trailer? There are several options and many topic's on this subject so I would suggest go up to the search query and click, type in awning and there should be pages of awning topic's for you.
I was looking at Vintage/retro awnings today. I just googled vintage awning and retro awning. Lot's of cute stuff out there.
Oh and Welcome to Fiberglass, glad you joined us. Please do post pic's of your restored Ventura
..... We like pic's here...................