SUCCESS. The problem has been resolved. Although I did not get a reply from the technician from Moen I decided to drive to their office, get the new hose, install it and if it works great - if not I was at the right place for them to determine what the additional problem is.
The new hose worked and through discussion with their staff I learned the two washers on the Moen hose were bigger than those from the hoses from the toilet or from Plumbshop and thus did not seal properly. Not only that but they gave me extra 'O' rings and a cartridge plus sold me the hose at a good discounted price.
I learned the diagram in our Airstream manual, although it is a Riser faucet, is not the same as Airstream changed some of the parts. If the faucet could not have been fixed, and given this faucet is no longer available, there was the option of buying two different faucets that have could have been suitable replacements.
Finally, it seems Moen has a lifetime warranty on their products but only those sold after 1995 which is good news.
1994 34' Limited
2004 GMC 2500 HD