How to find vent location

[hobie16]

I have a 2015 sequoia 38HRL. I wish to install a Max air vent in the bedroom but don't know the exact location of the factory framing. I have called the Crossroads /Redwood customer service but was told that the drawings they have on file don't show the location.

I can make an educated guess but would hate to make a mistake.

Any other owners out there who can help??

[Kaidocl]

Unless pre wired the will tell you it was not designed for it.
I tried for years to add 3erd AC and always same answer and most places dont want the liability

[Elliott & Vicky]

Tried to put in a second AC in my 2014 and was told it was prewired, and there is a breaker for it. Upon looking through the return vents with an endoscope, there is no framing for it. It would be a costly installation. Looking into the AC ducts the same way, there are ducts coming form the location where it should go. The dealer and I gave up.