I have a scene transistioning from the "cab" of a motor home to a room in the "rear" of the motorhome. The action and dialogue are both actors at the same time. What would be the best way to show that without putting in the headers
INT. MOTORHOME CAB
INT. MOTORHOME REAR CUBIBLE

for each movement in the scene.

Really, really new at this so any info is appreciated.

Thanks

INT.MOTORHOME CAB/PARLOR
This will work. There is no need to list a new transition for every proximate location if the story action makes clear where your characters are at any given time.
For example: transiioning from a moving car to a house would be done with two transitions.
INT/EXT - MOVING CAR - BACK SEAT (The exterior presumes photographing the moving car from outside as well as the two characters in dialogue in the back seat with scenery changing out of the window. A moving car.)

(THE ACTION WOULD HAVE TO BE DESCRIBED)
Millie(PRESUMABLY THE DRIVER) pulls into the driveway of a Victorian mansion.

(TRANSITION)
EXT./INT. UNCLE JAKE'S MANSION
Paul and Suzette (CHARACTERS FROM THE BACK SEAT) exit Millie's car and enter the front door.
Paul searches the parlor.
Suzette races up stairs to the second floor bedroom.

I truly hope this helps to explain it.
A good book to help you with all this is:
THE SCREENWRITER'S BIBLE, by David Trottier

"It's never too late to become what you might have been."
- George Eliot

If it's one locale, you can just put INT. MOTORHOME and describe where people are in the description.

Or put

INTERCUT - INT. MOTORHOME CAB/MOTORHOME REAR CUBICLE

Or

INT. MOTORHOME CAB/MOTORHOME REAR CUBICLE (INTERCUT AS NEEDED)

Check out cool videos at www.MastersofHumility.com

Thank you for the quick responses. Two good points and along the line of what I was thinking, but was not exactly sure how to do that. Thanks for the help, I can clearly see how that would work.