air conditioner air flow problem

[strawberryjo]

Hi all,
I have a "74 ambassador that has had the air unit replaced sometime in the past.
The vent to the rear of the camper is partially blocked by the kitchen wall.
My understanding is that this is commonplace without original equipment.
Cooling the rear bedroom is not what it should be.

What have some of you done to get the cool air out of the livingroom and hall into the rear of the camper? Fans help. but is there a way to make an attachment to the vent that will guide the cool air to the back?

thanks for your time,
Joe