Thank you Jim... yes that is what the issue was my Adobe was not current but have it now and thank you so very much, it has given me much insight to this 1968 I need to learn about because I have no knowledge of these campers.
Just read your message and tried opening the PDF file with the 1969 operators manual. Your probably not going want to read this, but it opened right up. I scrolled through all the pages and everything is there. It did take a bit longer to open than I remember, but I think that's because we now have the current version of Adobe, and I suspect that may have made a difference.