Have SEVERAL questions before buying a 1996 Sun Voyager

[LazyJ]

I am new to this site and and so glad to find it. I have several questions and hope I am posting to the right place.
This Gulf Stream 1996 Sun Voyager is a one owner with 49,000. It has been garage kept since new. Besides some minor cosmetic issues, the coach drove and sounded good. Thanks in advance for any help you may have.

1) There is an air flow restriction in the A/C duct. There is evidence of mice in the vents and have possible caused the restriction. Do you have to take the roof air off to be able to get to the duct work to clean them out?

2) Does anyone know if the queen size mattress is pretty standard to buy anywhere, or will I have to special order it?

3) Any honest opinions about the Sun Voyager will be appreciated.