Just to update all that helped with advice...
My wife returned last week to look at the coach again, and specifically the roof.
She determined that the roof was very solid, and it was only the vinyl that had unglued from the roof.
As for the jacks, it was clear that they worked in the very recent past. The dealer (consignment) was on the phone with owner, who kept telling them to "try this...", but in the end, they didn't work. Hopefully, we can get them working for not too much $$.
She negotiated with them very successfully, and we are now the happy owners of this great coach.
The deal is closed, insurance in place, now just waiting for the check to clear. We hope to pick it up this coming Saturday.
I've had lots of very helpful comments and messages, and it looks like there's lots of help available on this forum.
Reminds me very much of another forum in which I'm active (Concours Owners Group), with lots of knowledgeable members who are willing and able to offer good advice.
Hopefully I will be able to contribute once in a while to the knowledge base.
Jorge
1990 Holiday Rambler Limited 37'